"Multipart body must have at least one part"

In one of StackOverflow asked question (react-native upload pictures on android) described request with param “FormData”, but I requested GET request without data and got same message!

react-native app with ProGuard enabled = true

App crashed on first request.

06-16 14:00:30.971: E/AndroidRuntime(14321): java.lang.IllegalStateException: Multipart body must have at least one part.
06-16 14:00:30.971: E/AndroidRuntime(14321):    at okhttp3.MultipartBody$Builder.build(SourceFile:327)
06-16 14:00:30.971: E/AndroidRuntime(14321):    at com.facebook.react.modules.network.NetworkingModule.sendRequest(SourceFile:309)
06-16 14:00:30.971: E/AndroidRuntime(14321):    at java.lang.reflect.Method.invoke(Native Method)
06-16 14:00:30.971: E/AndroidRuntime(14321):    at java.lang.reflect.Method.invoke(Method.java:372)
06-16 14:00:30.971: E/AndroidRuntime(14321):    at com.facebook.react.bridge.BaseJavaModule$b.a(SourceFile:345)
06-16 14:00:30.971: E/AndroidRuntime(14321):    at com.facebook.react.cxxbridge.JavaModuleWrapper.invoke(SourceFile:136)
06-16 14:00:30.971: E/AndroidRuntime(14321):    at com.facebook.react.bridge.queue.NativeRunnable.run(Native Method)
06-16 14:00:30.971: E/AndroidRuntime(14321):    at android.os.Handler.handleCallback(Handler.java:739)
06-16 14:00:30.971: E/AndroidRuntime(14321):    at android.os.Handler.dispatchMessage(Handler.java:95)
06-16 14:00:30.971: E/AndroidRuntime(14321):    at com.facebook.react.bridge.queue.a.dispatchMessage(SourceFile:31)
06-16 14:00:30.971: E/AndroidRuntime(14321):    at android.os.Looper.loop(Looper.java:135)
06-16 14:00:30.971: E/AndroidRuntime(14321):    at com.facebook.react.bridge.queue.MessageQueueThreadImpl$3.run(SourceFile:196)
06-16 14:00:30.971: E/AndroidRuntime(14321):    at java.lang.Thread.run(Thread.java:818)

https://stackoverflow.com/questions/44591453/multipart-body-must-have-at-least-one-part

[iegik]

I tried to pass body as empty FormData, so message about body without any part of it.

[andreykarnovskiy]

Guys, always check module dependencies and add latest version of the library to the module dependencies, otherwise module will use obsolete version and you dont notice it. Оften this is the cause of problems.