java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.wenming.weiswift.ui.login.fragment.post.picselect.adapter.ImgFolderAdapter.getCount(ImgFolderAdapter.java:49)
at android.widget.ListView.setAdapter(ListView.java:480)
at com.wenming.weiswift.ui.login.fragment.post.picselect.popwindow.ImgFolderPopWindow.initListView(ImgFolderPopWindow.java:52)
at com.wenming.weiswift.ui.login.fragment.post.picselect.popwindow.ImgFolderPopWindow.(ImgFolderPopWindow.java:45)
at com.wenming.weiswift.ui.login.fragment.post.picselect.activity.AlbumActivity$2.onClick(AlbumActivity.java:111)
at android.view.View.performClick(View.java:4438)
at android.view.View$PerformClick.run(View.java:18439)
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:5095)
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:786)

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