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This exception has no message.
java.lang.NullPointerException: 	at com.artifex.mupdfdemo.ChoosePDFAdapter.getView(ChoosePDFAdapter.java:60)	at android.widget.AbsListView.obtainView(AbsListView.java:2255)	at android.widget.ListView.makeAndAddView(ListView.java:1790)	at android.widget.ListView.fillDown(ListView.java:691)	at android.widget.ListView.fillFromTop(ListView.java:752)	at android.widget.ListView.layoutChildren(ListView.java:1616)	at android.widget.AbsListView.onLayout(AbsListView.java:2087)	at android.view.View.layout(View.java:14841)	at android.view.ViewGroup.layout(ViewGroup.java:4631)	at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453)	at android.widget.FrameLayout.onLayout(FrameLayout.java:388)	at android.view.View.layout(View.java:14841)	at android.view.ViewGroup.layout(ViewGroup.java:4631)	at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1717)	at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1571)	at android.widget.LinearLayout.onLayout(LinearLayout.java:1480)	at android.view.View.layout(View.java:14841)	at android.view.ViewGroup.layout(ViewGroup.java:4631)	at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453)	at android.widget.FrameLayout.onLayout(FrameLayout.java:388)	at android.view.View.layout(View.java:14841)	at android.view.ViewGroup.layout(ViewGroup.java:4631)	at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:1986)	at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1743)	at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:996)	at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5603)	at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)	at android.view.Choreographer.doCallbacks(Choreographer.java:574)	at android.view.Choreographer.doFrame(Choreographer.java:544)	at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)	at android.os.Handler.handleCallback(Handler.java:733)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:136)	at android.app.ActivityThread.main(ActivityThread.java:5146)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:515)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:732)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:566)	at dalvik.system.NativeStart.main(Native Method)