Lavalink crashes while trying to start up

Description

When I try to do java -jar Lavalink.jar, it shows me this looooong error: `2020-04-28 21:59:28.447 WARN 13752 — [kground-preinit] o.s.h.c.j.Jackson2ObjectMapperBuilder : For Jackson Kotlin classes support please add “com.fasterxml.jackson.module:jackson-module-kotlin” to the classpath 2020-04-28 21:59:28.496 ERROR 13752 — [ main] lavalink.server.Launcher : Application failed

java.lang.UnsupportedClassVersionError: lavalink/server/info/AppInfo has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0 at java.lang.ClassLoader.defineClass1(Native Method) ~[na:1.8.0_251] at java.lang.ClassLoader.defineClass(Unknown Source) ~[na:1.8.0_251] at java.security.SecureClassLoader.defineClass(Unknown Source) ~[na:1.8.0_251] at java.net.URLClassLoader.defineClass(Unknown Source) ~[na:1.8.0_251] at java.net.URLClassLoader.access$100(Unknown Source) ~[na:1.8.0_251] at java.net.URLClassLoader$1.run(Unknown Source) ~[na:1.8.0_251] at java.net.URLClassLoader$1.run(Unknown Source) ~[na:1.8.0_251] at java.security.AccessController.doPrivileged(Native Method) ~[na:1.8.0_251] at java.net.URLClassLoader.findClass(Unknown Source) ~[na:1.8.0_251] at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_251] at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:93) ~[Lavalink.jar:na] at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_251] at lavalink.server.Launcher.getVersionInfo(Launcher.kt:50) [classes!/:na] at lavalink.server.Launcher.getVersionInfo$default(Launcher.kt:49) [classes!/:na] at lavalink.server.Launcher$main$1.onApplicationEvent(Launcher.kt:118) ~[classes!/:na] at lavalink.server.Launcher$main$1.onApplicationEvent(Launcher.kt:43) ~[classes!/:na] at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) ~[spring-context-5.1.9.RELEASE.jar!/:5.1.9.RELEASE] at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) ~[spring-context-5.1.9.RELEASE.jar!/:5.1.9.RELEASE] at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) ~[spring-context-5.1.9.RELEASE.jar!/:5.1.9.RELEASE] at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:127) ~[spring-context-5.1.9.RELEASE.jar!/:5.1.9.RELEASE] at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:76) ~[spring-boot-2.1.8.RELEASE.jar!/:2.1.8.RELEASE] at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:53) ~[spring-boot-2.1.8.RELEASE.jar!/:2.1.8.RELEASE] at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:342) ~[spring-boot-2.1.8.RELEASE.jar!/:2.1.8.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:305) ~[spring-boot-2.1.8.RELEASE.jar!/:2.1.8.RELEASE] at lavalink.server.Launcher.main(Launcher.kt:127) [classes!/:na] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_251] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_251] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_251] at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_251] at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48) [Lavalink.jar:na] at org.springframework.boot.loader.Launcher.launch(Launcher.java:87) [Lavalink.jar:na] at org.springframework.boot.loader.Launcher.launch(Launcher.java:51) [Lavalink.jar:na] at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:52) [Lavalink.jar:na]

2020-04-28 21:59:28.501 ERROR 13752 — [ main] o.s.boot.SpringApplication : Application run failed

java.lang.UnsupportedClassVersionError: lavalink/server/info/AppInfo has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0 at java.lang.ClassLoader.defineClass1(Native Method) ~[na:1.8.0_251] at java.lang.ClassLoader.defineClass(Unknown Source) ~[na:1.8.0_251] at java.security.SecureClassLoader.defineClass(Unknown Source) ~[na:1.8.0_251] at java.net.URLClassLoader.defineClass(Unknown Source) ~[na:1.8.0_251] at java.net.URLClassLoader.access$100(Unknown Source) ~[na:1.8.0_251] at java.net.URLClassLoader$1.run(Unknown Source) ~[na:1.8.0_251] at java.net.URLClassLoader$1.run(Unknown Source) ~[na:1.8.0_251] at java.security.AccessController.doPrivileged(Native Method) ~[na:1.8.0_251] at java.net.URLClassLoader.findClass(Unknown Source) ~[na:1.8.0_251] at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_251] at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:93) ~[Lavalink.jar:na] at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_251] at lavalink.server.Launcher.getVersionInfo(Launcher.kt:50) [classes!/:na] at lavalink.server.Launcher.getVersionInfo$default(Launcher.kt:49) [classes!/:na] at lavalink.server.Launcher$main$1.onApplicationEvent(Launcher.kt:118) ~[classes!/:na] at lavalink.server.Launcher$main$1.onApplicationEvent(Launcher.kt:43) ~[classes!/:na] at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) ~[spring-context-5.1.9.RELEASE.jar!/:5.1.9.RELEASE] at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) ~[spring-context-5.1.9.RELEASE.jar!/:5.1.9.RELEASE] at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) ~[spring-context-5.1.9.RELEASE.jar!/:5.1.9.RELEASE] at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:127) ~[spring-context-5.1.9.RELEASE.jar!/:5.1.9.RELEASE] at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:76) ~[spring-boot-2.1.8.RELEASE.jar!/:2.1.8.RELEASE] at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:53) ~[spring-boot-2.1.8.RELEASE.jar!/:2.1.8.RELEASE] at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:342) ~[spring-boot-2.1.8.RELEASE.jar!/:2.1.8.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:305) ~[spring-boot-2.1.8.RELEASE.jar!/:2.1.8.RELEASE] at lavalink.server.Launcher.main(Launcher.kt:127) [classes!/:na] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_251] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_251] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_251] at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_251] at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48) [Lavalink.jar:na] at org.springframework.boot.loader.Launcher.launch(Launcher.java:87) [Lavalink.jar:na] at org.springframework.boot.loader.Launcher.launch(Launcher.java:51) [Lavalink.jar:na] at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:52) [Lavalink.jar:na]`

Version info

Client used:

Output of java -jar Lavalink.jar --version:

Exception in thread "main" java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48)
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:87)
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:51)
        at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:52)
Caused by: java.lang.UnsupportedClassVersionError: lavalink/server/info/AppInfo has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(Unknown Source)
        at java.security.SecureClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.access$100(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:93)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at lavalink.server.Launcher.getVersionInfo(Launcher.kt:50)
        at lavalink.server.Launcher.main(Launcher.kt:108)
        ... 8 more

Log: `2020-04-28 21:55:13.132 WARN 3920 — [background-preinit] o.s.h.c.j.Jackson2ObjectMapperBuilder : For Jackson Kotlin classes support please add “com.fasterxml.jackson.module:jackson-module-kotlin” to the classpath 2020-04-28 21:55:13.172 ERROR 3920 — [main] lavalink.server.Launcher : Application failed

java.lang.UnsupportedClassVersionError: lavalink/server/info/AppInfo has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0 at java.lang.ClassLoader.defineClass1(Native Method) ~[na:1.8.0_251] at java.lang.ClassLoader.defineClass(Unknown Source) ~[na:1.8.0_251] at java.security.SecureClassLoader.defineClass(Unknown Source) ~[na:1.8.0_251] at java.net.URLClassLoader.defineClass(Unknown Source) ~[na:1.8.0_251] at java.net.URLClassLoader.access$100(Unknown Source) ~[na:1.8.0_251] at java.net.URLClassLoader$1.run(Unknown Source) ~[na:1.8.0_251] at java.net.URLClassLoader$1.run(Unknown Source) ~[na:1.8.0_251] at java.security.AccessController.doPrivileged(Native Method) ~[na:1.8.0_251] at java.net.URLClassLoader.findClass(Unknown Source) ~[na:1.8.0_251] at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_251] at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:93) ~[Lavalink.jar:na] at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_251] at lavalink.server.Launcher.getVersionInfo(Launcher.kt:50) [classes!/:na] at lavalink.server.Launcher.getVersionInfo$default(Launcher.kt:49) [classes!/:na] at lavalink.server.Launcher$main$1.onApplicationEvent(Launcher.kt:118) ~[classes!/:na] at lavalink.server.Launcher$main$1.onApplicationEvent(Launcher.kt:43) ~[classes!/:na] at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) ~[spring-context-5.1.9.RELEASE.jar!/:5.1.9.RELEASE] at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) ~[spring-context-5.1.9.RELEASE.jar!/:5.1.9.RELEASE] at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) ~[spring-context-5.1.9.RELEASE.jar!/:5.1.9.RELEASE] at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:127) ~[spring-context-5.1.9.RELEASE.jar!/:5.1.9.RELEASE] at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:76) ~[spring-boot-2.1.8.RELEASE.jar!/:2.1.8.RELEASE] at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:53) ~[spring-boot-2.1.8.RELEASE.jar!/:2.1.8.RELEASE] at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:342) ~[spring-boot-2.1.8.RELEASE.jar!/:2.1.8.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:305) ~[spring-boot-2.1.8.RELEASE.jar!/:2.1.8.RELEASE] at lavalink.server.Launcher.main(Launcher.kt:127) [classes!/:na] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_251] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_251] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_251] at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_251] at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48) [Lavalink.jar:na] at org.springframework.boot.loader.Launcher.launch(Launcher.java:87) [Lavalink.jar:na] at org.springframework.boot.loader.Launcher.launch(Launcher.java:51) [Lavalink.jar:na] at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:52) [Lavalink.jar:na]

2020-04-28 21:55:13.177 ERROR 3920 — [main] o.s.boot.SpringApplication : Application run failed

java.lang.UnsupportedClassVersionError: lavalink/server/info/AppInfo has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0 at java.lang.ClassLoader.defineClass1(Native Method) ~[na:1.8.0_251] at java.lang.ClassLoader.defineClass(Unknown Source) ~[na:1.8.0_251] at java.security.SecureClassLoader.defineClass(Unknown Source) ~[na:1.8.0_251] at java.net.URLClassLoader.defineClass(Unknown Source) ~[na:1.8.0_251] at java.net.URLClassLoader.access$100(Unknown Source) ~[na:1.8.0_251] at java.net.URLClassLoader$1.run(Unknown Source) ~[na:1.8.0_251] at java.net.URLClassLoader$1.run(Unknown Source) ~[na:1.8.0_251] at java.security.AccessController.doPrivileged(Native Method) ~[na:1.8.0_251] at java.net.URLClassLoader.findClass(Unknown Source) ~[na:1.8.0_251] at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_251] at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:93) ~[Lavalink.jar:na] at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_251] at lavalink.server.Launcher.getVersionInfo(Launcher.kt:50) [classes!/:na] at lavalink.server.Launcher.getVersionInfo$default(Launcher.kt:49) [classes!/:na] at lavalink.server.Launcher$main$1.onApplicationEvent(Launcher.kt:118) ~[classes!/:na] at lavalink.server.Launcher$main$1.onApplicationEvent(Launcher.kt:43) ~[classes!/:na] at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) ~[spring-context-5.1.9.RELEASE.jar!/:5.1.9.RELEASE] at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) ~[spring-context-5.1.9.RELEASE.jar!/:5.1.9.RELEASE] at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) ~[spring-context-5.1.9.RELEASE.jar!/:5.1.9.RELEASE] at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:127) ~[spring-context-5.1.9.RELEASE.jar!/:5.1.9.RELEASE] at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:76) ~[spring-boot-2.1.8.RELEASE.jar!/:2.1.8.RELEASE] at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:53) ~[spring-boot-2.1.8.RELEASE.jar!/:2.1.8.RELEASE] at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:342) ~[spring-boot-2.1.8.RELEASE.jar!/:2.1.8.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:305) ~[spring-boot-2.1.8.RELEASE.jar!/:2.1.8.RELEASE] at lavalink.server.Launcher.main(Launcher.kt:127) [classes!/:na] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_251] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_251] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_251] at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_251] at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48) [Lavalink.jar:na] at org.springframework.boot.loader.Launcher.launch(Launcher.java:87) [Lavalink.jar:na] at org.springframework.boot.loader.Launcher.launch(Launcher.java:51) [Lavalink.jar:na] at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:52) [Lavalink.jar:na]

2020-04-28 21:58:02.235 WARN 11808 — [background-preinit] o.s.h.c.j.Jackson2ObjectMapperBuilder : For Jackson Kotlin classes support please add “com.fasterxml.jackson.module:jackson-module-kotlin” to the classpath 2020-04-28 21:58:02.294 ERROR 11808 — [main] lavalink.server.Launcher : Application failed

java.lang.UnsupportedClassVersionError: lavalink/server/info/AppInfo has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0 at java.lang.ClassLoader.defineClass1(Native Method) ~[na:1.8.0_251] at java.lang.ClassLoader.defineClass(Unknown Source) ~[na:1.8.0_251] at java.security.SecureClassLoader.defineClass(Unknown Source) ~[na:1.8.0_251] at java.net.URLClassLoader.defineClass(Unknown Source) ~[na:1.8.0_251] at java.net.URLClassLoader.access$100(Unknown Source) ~[na:1.8.0_251] at java.net.URLClassLoader$1.run(Unknown Source) ~[na:1.8.0_251] at java.net.URLClassLoader$1.run(Unknown Source) ~[na:1.8.0_251] at java.security.AccessController.doPrivileged(Native Method) ~[na:1.8.0_251] at java.net.URLClassLoader.findClass(Unknown Source) ~[na:1.8.0_251] at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_251] at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:93) ~[Lavalink.jar:na] at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_251] at lavalink.server.Launcher.getVersionInfo(Launcher.kt:50) [classes!/:na] at lavalink.server.Launcher.getVersionInfo$default(Launcher.kt:49) [classes!/:na] at lavalink.server.Launcher$main$1.onApplicationEvent(Launcher.kt:118) ~[classes!/:na] at lavalink.server.Launcher$main$1.onApplicationEvent(Launcher.kt:43) ~[classes!/:na] at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) ~[spring-context-5.1.9.RELEASE.jar!/:5.1.9.RELEASE] at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) ~[spring-context-5.1.9.RELEASE.jar!/:5.1.9.RELEASE] at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) ~[spring-context-5.1.9.RELEASE.jar!/:5.1.9.RELEASE] at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:127) ~[spring-context-5.1.9.RELEASE.jar!/:5.1.9.RELEASE] at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:76) ~[spring-boot-2.1.8.RELEASE.jar!/:2.1.8.RELEASE] at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:53) ~[spring-boot-2.1.8.RELEASE.jar!/:2.1.8.RELEASE] at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:342) ~[spring-boot-2.1.8.RELEASE.jar!/:2.1.8.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:305) ~[spring-boot-2.1.8.RELEASE.jar!/:2.1.8.RELEASE] at lavalink.server.Launcher.main(Launcher.kt:127) [classes!/:na] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_251] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_251] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_251] at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_251] at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48) [Lavalink.jar:na] at org.springframework.boot.loader.Launcher.launch(Launcher.java:87) [Lavalink.jar:na] at org.springframework.boot.loader.Launcher.launch(Launcher.java:51) [Lavalink.jar:na] at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:52) [Lavalink.jar:na]

2020-04-28 21:58:02.299 ERROR 11808 — [main] o.s.boot.SpringApplication : Application run failed

java.lang.UnsupportedClassVersionError: lavalink/server/info/AppInfo has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0 at java.lang.ClassLoader.defineClass1(Native Method) ~[na:1.8.0_251] at java.lang.ClassLoader.defineClass(Unknown Source) ~[na:1.8.0_251] at java.security.SecureClassLoader.defineClass(Unknown Source) ~[na:1.8.0_251] at java.net.URLClassLoader.defineClass(Unknown Source) ~[na:1.8.0_251] at java.net.URLClassLoader.access$100(Unknown Source) ~[na:1.8.0_251] at java.net.URLClassLoader$1.run(Unknown Source) ~[na:1.8.0_251] at java.net.URLClassLoader$1.run(Unknown Source) ~[na:1.8.0_251] at java.security.AccessController.doPrivileged(Native Method) ~[na:1.8.0_251] at java.net.URLClassLoader.findClass(Unknown Source) ~[na:1.8.0_251] at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_251] at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:93) ~[Lavalink.jar:na] at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_251] at lavalink.server.Launcher.getVersionInfo(Launcher.kt:50) [classes!/:na] at lavalink.server.Launcher.getVersionInfo$default(Launcher.kt:49) [classes!/:na] at lavalink.server.Launcher$main$1.onApplicationEvent(Launcher.kt:118) ~[classes!/:na] at lavalink.server.Launcher$main$1.onApplicationEvent(Launcher.kt:43) ~[classes!/:na] at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) ~[spring-context-5.1.9.RELEASE.jar!/:5.1.9.RELEASE] at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) ~[spring-context-5.1.9.RELEASE.jar!/:5.1.9.RELEASE] at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) ~[spring-context-5.1.9.RELEASE.jar!/:5.1.9.RELEASE] at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:127) ~[spring-context-5.1.9.RELEASE.jar!/:5.1.9.RELEASE] at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:76) ~[spring-boot-2.1.8.RELEASE.jar!/:2.1.8.RELEASE] at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:53) ~[spring-boot-2.1.8.RELEASE.jar!/:2.1.8.RELEASE] at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:342) ~[spring-boot-2.1.8.RELEASE.jar!/:2.1.8.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:305) ~[spring-boot-2.1.8.RELEASE.jar!/:2.1.8.RELEASE] at lavalink.server.Launcher.main(Launcher.kt:127) [classes!/:na] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_251] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_251] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_251] at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_251] at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48) [Lavalink.jar:na] at org.springframework.boot.loader.Launcher.launch(Launcher.java:87) [Lavalink.jar:na] at org.springframework.boot.loader.Launcher.launch(Launcher.java:51) [Lavalink.jar:na] at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:52) [Lavalink.jar:na]

2020-04-28 21:59:28.447 WARN 13752 — [background-preinit] o.s.h.c.j.Jackson2ObjectMapperBuilder : For Jackson Kotlin classes support please add “com.fasterxml.jackson.module:jackson-module-kotlin” to the classpath 2020-04-28 21:59:28.496 ERROR 13752 — [main] lavalink.server.Launcher : Application failed

java.lang.UnsupportedClassVersionError: lavalink/server/info/AppInfo has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0 at java.lang.ClassLoader.defineClass1(Native Method) ~[na:1.8.0_251] at java.lang.ClassLoader.defineClass(Unknown Source) ~[na:1.8.0_251] at java.security.SecureClassLoader.defineClass(Unknown Source) ~[na:1.8.0_251] at java.net.URLClassLoader.defineClass(Unknown Source) ~[na:1.8.0_251] at java.net.URLClassLoader.access$100(Unknown Source) ~[na:1.8.0_251] at java.net.URLClassLoader$1.run(Unknown Source) ~[na:1.8.0_251] at java.net.URLClassLoader$1.run(Unknown Source) ~[na:1.8.0_251] at java.security.AccessController.doPrivileged(Native Method) ~[na:1.8.0_251] at java.net.URLClassLoader.findClass(Unknown Source) ~[na:1.8.0_251] at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_251] at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:93) ~[Lavalink.jar:na] at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_251] at lavalink.server.Launcher.getVersionInfo(Launcher.kt:50) [classes!/:na] at lavalink.server.Launcher.getVersionInfo$default(Launcher.kt:49) [classes!/:na] at lavalink.server.Launcher$main$1.onApplicationEvent(Launcher.kt:118) ~[classes!/:na] at lavalink.server.Launcher$main$1.onApplicationEvent(Launcher.kt:43) ~[classes!/:na] at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) ~[spring-context-5.1.9.RELEASE.jar!/:5.1.9.RELEASE] at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) ~[spring-context-5.1.9.RELEASE.jar!/:5.1.9.RELEASE] at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) ~[spring-context-5.1.9.RELEASE.jar!/:5.1.9.RELEASE] at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:127) ~[spring-context-5.1.9.RELEASE.jar!/:5.1.9.RELEASE] at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:76) ~[spring-boot-2.1.8.RELEASE.jar!/:2.1.8.RELEASE] at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:53) ~[spring-boot-2.1.8.RELEASE.jar!/:2.1.8.RELEASE] at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:342) ~[spring-boot-2.1.8.RELEASE.jar!/:2.1.8.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:305) ~[spring-boot-2.1.8.RELEASE.jar!/:2.1.8.RELEASE] at lavalink.server.Launcher.main(Launcher.kt:127) [classes!/:na] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_251] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_251] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_251] at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_251] at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48) [Lavalink.jar:na] at org.springframework.boot.loader.Launcher.launch(Launcher.java:87) [Lavalink.jar:na] at org.springframework.boot.loader.Launcher.launch(Launcher.java:51) [Lavalink.jar:na] at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:52) [Lavalink.jar:na]

2020-04-28 21:59:28.501 ERROR 13752 — [main] o.s.boot.SpringApplication : Application run failed

java.lang.UnsupportedClassVersionError: lavalink/server/info/AppInfo has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0 at java.lang.ClassLoader.defineClass1(Native Method) ~[na:1.8.0_251] at java.lang.ClassLoader.defineClass(Unknown Source) ~[na:1.8.0_251] at java.security.SecureClassLoader.defineClass(Unknown Source) ~[na:1.8.0_251] at java.net.URLClassLoader.defineClass(Unknown Source) ~[na:1.8.0_251] at java.net.URLClassLoader.access$100(Unknown Source) ~[na:1.8.0_251] at java.net.URLClassLoader$1.run(Unknown Source) ~[na:1.8.0_251] at java.net.URLClassLoader$1.run(Unknown Source) ~[na:1.8.0_251] at java.security.AccessController.doPrivileged(Native Method) ~[na:1.8.0_251] at java.net.URLClassLoader.findClass(Unknown Source) ~[na:1.8.0_251] at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_251] at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:93) ~[Lavalink.jar:na] at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_251] at lavalink.server.Launcher.getVersionInfo(Launcher.kt:50) [classes!/:na] at lavalink.server.Launcher.getVersionInfo$default(Launcher.kt:49) [classes!/:na] at lavalink.server.Launcher$main$1.onApplicationEvent(Launcher.kt:118) ~[classes!/:na] at lavalink.server.Launcher$main$1.onApplicationEvent(Launcher.kt:43) ~[classes!/:na] at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) ~[spring-context-5.1.9.RELEASE.jar!/:5.1.9.RELEASE] at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) ~[spring-context-5.1.9.RELEASE.jar!/:5.1.9.RELEASE] at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) ~[spring-context-5.1.9.RELEASE.jar!/:5.1.9.RELEASE] at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:127) ~[spring-context-5.1.9.RELEASE.jar!/:5.1.9.RELEASE] at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:76) ~[spring-boot-2.1.8.RELEASE.jar!/:2.1.8.RELEASE] at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:53) ~[spring-boot-2.1.8.RELEASE.jar!/:2.1.8.RELEASE] at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:342) ~[spring-boot-2.1.8.RELEASE.jar!/:2.1.8.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:305) ~[spring-boot-2.1.8.RELEASE.jar!/:2.1.8.RELEASE] at lavalink.server.Launcher.main(Launcher.kt:127) [classes!/:na] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_251] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_251] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_251] at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_251] at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48) [Lavalink.jar:na] at org.springframework.boot.loader.Launcher.launch(Launcher.java:87) [Lavalink.jar:na] at org.springframework.boot.loader.Launcher.launch(Launcher.java:51) [Lavalink.jar:na] at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:52) [Lavalink.jar:na]

`

[ghost]

Thanks, and may I ask why I can’t use the name Fredbot? It’s inspired by my Discord username

[ghost]

You have not updated to java 13.

Fixed it, had to delete the normal Java. Thanks!