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java.lang.NullPointerException: 	at com.wama.Conversation.YoAnimation(Conversation.java)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:525)	at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:18)	at android.view.View.performClick(View.java:4240)	at android.view.View$PerformClick.run(View.java:17746)	at android.os.Handler.handleCallback(Handler.java:730)	at android.os.Handler.dispatchMessage(Handler.java:92)	at android.os.Looper.loop(Looper.java:137)	at android.app.ActivityThread.main(ActivityThread.java:5166)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:525)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:745)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:561)	at dalvik.system.NativeStart.main(Native Method)