java.util.ConcurrentModificationException: This exception has no message.

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java.util.ConcurrentModificationException:
at java.util.Hashtable$HashIterator.nextEntry(Hashtable.java:727)
at java.util.Hashtable$EntryIterator.next(Hashtable.java:778)
at rx.plugins.RxJavaPlugins.getPluginImplementationViaProperty(RxJavaPlugins.java:177)
at rx.plugins.RxJavaPlugins.getObservableExecutionHook(RxJavaPlugins.java:130)
at rx.Observable.(Observable.java)
at com.trello.rxlifecycle.components.support.RxAppCompatActivity.(RxAppCompatActivity.java)
at java.lang.Class.newInstanceImpl(Class.java)
at java.lang.Class.newInstance(Class.java:1208)
at android.app.Instrumentation.newActivity(Instrumentation.java:1061)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2114)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2248)
at android.app.ActivityThread.access$800(ActivityThread.java:136)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1197)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5020)
at java.lang.reflect.Method.invokeNative(Method.java)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at dalvik.system.NativeStart.main(NativeStart.java)

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