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java.util.ConcurrentModificationException: 	at java.util.Hashtable$HashIterator.nextEntry(	at java.util.Hashtable$	at java.util.Hashtable$	at rx.plugins.RxJavaPlugins.getPluginImplementationViaProperty(	at rx.plugins.RxJavaPlugins.getObservableExecutionHook(	at rx.Observable.(	at	at java.lang.Class.newInstanceImpl(	at java.lang.Class.newInstance(	at	at	at	at$800(	at$H.handleMessage(	at android.os.Handler.dispatchMessage(	at android.os.Looper.loop(	at	at java.lang.reflect.Method.invokeNative(	at java.lang.reflect.Method.invoke(	at$	at	at dalvik.system.NativeStart.main(