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java.lang.NullPointerException: Attempt to invoke virtual method     'java.lang.String java.lang.Object.toString()' on a null object reference	at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:394)	at android.widget.ArrayAdapter.getView(ArrayAdapter.java:362)	at android.widget.AbsListView.obtainView(AbsListView.java:2344)	at android.widget.ListView.makeAndAddView(ListView.java:1864)	at android.widget.ListView.fillDown(ListView.java:698)	at android.widget.ListView.fillFromTop(ListView.java:759)	at android.widget.ListView.layoutChildren(ListView.java:1659)	at android.widget.AbsListView.onLayout(AbsListView.java:2148)	at android.view.View.layout(View.java:15636)	at android.view.ViewGroup.layout(ViewGroup.java:4967)	at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1703)	at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1557)	at android.widget.LinearLayout.onLayout(LinearLayout.java:1466)	at android.view.View.layout(View.java:15636)	at android.view.ViewGroup.layout(ViewGroup.java:4967)	at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1077)	at android.view.View.layout(View.java:15636)	at android.view.ViewGroup.layout(ViewGroup.java:4967)	at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)	at android.widget.FrameLayout.onLayout(FrameLayout.java:508)	at android.view.View.layout(View.java:15636)	at android.view.ViewGroup.layout(ViewGroup.java:4967)	at android.support.v7.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:435)	at android.view.View.layout(View.java:15636)	at android.view.ViewGroup.layout(ViewGroup.java:4967)	at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)	at android.widget.FrameLayout.onLayout(FrameLayout.java:508)	at android.view.View.layout(View.java:15636)	at android.view.ViewGroup.layout(ViewGroup.java:4967)	at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1703)	at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1557)	at android.widget.LinearLayout.onLayout(LinearLayout.java:1466)	at android.view.View.layout(View.java:15636)	at android.view.ViewGroup.layout(ViewGroup.java:4967)	at android.widget.FrameLayout.layoutChildren(FrameLayout.java:573)	at android.widget.FrameLayout.onLayout(FrameLayout.java:508)	at android.view.View.layout(View.java:15636)	at android.view.ViewGroup.layout(ViewGroup.java:4967)	at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2072)	at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1829)	at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1054)	at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5786)	at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)	at android.view.Choreographer.doCallbacks(Choreographer.java:580)	at android.view.Choreographer.doFrame(Choreographer.java:550)	at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)	at android.os.Handler.handleCallback(Handler.java:739)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:135)	at android.app.ActivityThread.main(ActivityThread.java:5289)	at java.lang.reflect.Method.invoke(Native Method)	at java.lang.reflect.Method.invoke(Method.java:372)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)