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Library incompatible with JDK 8.

See original GitHub issue

java.lang.UnsupportedClassVersionError: org/tinylog/Logger has been compiled by a more recent version of the Java Runtime (class file version 53.0), this version of the Java Runtime only recognizes class file versions up to 52.0
	at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_51]
	at java.lang.ClassLoader.defineClass(ClassLoader.java:760) ~[?:1.8.0_51]
	at java.lang.ClassLoader.defineClass(ClassLoader.java:642) ~[?:1.8.0_51]
	at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:129) ~[modlauncher-4.1.0.jar:?]
	at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:98) ~[modlauncher-4.1.0.jar:?]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_51]
	at com.mairwunnx.logblock.EntryPoint.<init>(EntryPoint.kt:18) ~[?:1.14.4-1.0.0]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_51]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:1.8.0_51]
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_51]
	at java.lang.reflect.Constructor.newInstance(Constructor.java:422) ~[?:1.8.0_51]
	at java.lang.Class.newInstance(Class.java:442) ~[?:1.8.0_51]
	at net.minecraftforge.fml.javafmlmod.FMLModContainer.constructMod(FMLModContainer.java:131) [?:28.2]
	at net.minecraftforge.fml.javafmlmod.FMLModContainer$$Lambda$2111/56050936.accept(Unknown Source) [?:28.2]
	at java.util.function.Consumer.lambda$andThen$14(Consumer.java:65) [?:1.8.0_51]
	at java.util.function.Consumer$$Lambda$2110/1004759548.accept(Unknown Source) [?:1.8.0_51]
	at java.util.function.Consumer.lambda$andThen$14(Consumer.java:65) [?:1.8.0_51]
	at java.util.function.Consumer$$Lambda$2110/1004759548.accept(Unknown Source) [?:1.8.0_51]
	at net.minecraftforge.fml.ModContainer.transitionState(ModContainer.java:112) [?:?]
	at net.minecraftforge.fml.ModList.lambda$null$10(ModList.java:134) [?:?]
	at net.minecraftforge.fml.ModList$$Lambda$2161/1407062065.accept(Unknown Source) [?:?]
	at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184) [?:1.8.0_51]
	at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1374) [?:1.8.0_51]
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:512) [?:1.8.0_51]
	at java.util.stream.ForEachOps$ForEachTask.compute(ForEachOps.java:291) [?:1.8.0_51]
	at java.util.concurrent.CountedCompleter.exec(CountedCompleter.java:731) [?:1.8.0_51]
	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289) [?:1.8.0_51]
	at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056) [?:1.8.0_51]
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1689) [?:1.8.0_51]
	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157) [?:1.8.0_51]