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Attempt to invoke virtual method 'void android.media.MediaPlayer.start()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.media.MediaPlayer.start()' on a null object reference	at com.example.android.miwok.NumbersActivity$1.onItemClick(NumbersActivity.java:46)	at android.widget.AdapterView.performItemClick(AdapterView.java:310)	at android.widget.AbsListView.performItemClick(AbsListView.java:1188)	at android.widget.AbsListView$PerformClick.run(AbsListView.java:3231)	at android.widget.AbsListView.onTouchUp(AbsListView.java:4176)	at android.widget.AbsListView.onTouchEvent(AbsListView.java:3887)	at android.view.View.dispatchTouchEvent(View.java:8593)	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2513)	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2157)	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2519)	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2171)	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2519)	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2171)	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2519)	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2171)	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2519)	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2171)	at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2519)	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2171)	at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2484)	at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1800)	at android.app.Activity.dispatchTouchEvent(Activity.java:2797)	at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:60)	at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2445)	at android.view.View.dispatchPointerEvent(View.java:8799)	at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4662)	at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4520)	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4034)	at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4087)	at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4053)	at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4190)	at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4061)	at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4247)	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4034)	at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4087)	at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4053)	at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4061)	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4034)	at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:6463)	at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:6437)	at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:6390)	at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:6622)	at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)	at android.os.MessageQueue.nativePollOnce(Native Method)	at android.os.MessageQueue.next(MessageQueue.java:148)	at android.os.Looper.loop(Looper.java:151)	at android.app.ActivityThread.main(ActivityThread.java:5649)	at java.lang.reflect.Method.invoke(Native Method)	at java.lang.reflect.Method.invoke(Method.java:372)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:959)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:754)