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java.lang.NullPointerException: println needs a message at android.util.Log.println_native(Native Method) at android.util.Log.d(Log.java:154) at com.example.android.prototypeapp.MainActivity$1$override.onClick(MainActivity.java:41) at com.example.android.prototypeapp.MainActivity$1$override.access$dispatch(MainActivity.java) at com.example.android.prototypeapp.MainActivity$1.onClick(MainActivity.java:0) at android.view.View.performClick(View.java:5264) at android.view.View$PerformClick.run(View.java:21297) at android.os.Handler.handleCallback(Handler.java:743) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:150) at android.app.ActivityThread.main(ActivityThread.java:5546) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:794) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:684)