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This exception has no message.
java.lang.NullPointerException: 	at com.zyd.eventbus.AActivity.onUseEvent(AActivity.java:47)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:515)	at org.greenrobot.eventbus.EventBus.invokeSubscriber(EventBus.java:485)	at org.greenrobot.eventbus.EventBus.postToSubscription(EventBus.java:420)	at org.greenrobot.eventbus.EventBus.postSingleEventForEventType(EventBus.java:397)	at org.greenrobot.eventbus.EventBus.postSingleEvent(EventBus.java:370)	at org.greenrobot.eventbus.EventBus.post(EventBus.java:251)	at com.zyd.eventbus.BActivity.backBActivity(BActivity.java:18)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:515)	at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:284)	at android.view.View.performClick(View.java:4438)	at android.view.View$PerformClick.run(View.java:18422)	at android.os.Handler.handleCallback(Handler.java:733)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:136)	at android.app.ActivityThread.main(ActivityThread.java:5045)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:515)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)	at dalvik.system.NativeStart.main(Native Method)