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java.lang.NullPointerException: 	at android.widget.ArrayAdapter.getCount(ArrayAdapter.java:330)	at android.widget.ListView.setAdapter(ListView.java:462)	at android.support.v7.app.AlertController.setupView(AlertController.java:538)	at android.support.v7.app.AlertController.installContent(AlertController.java:226)	at android.support.v7.app.AlertDialog.onCreate(AlertDialog.java:257)	at android.app.Dialog.dispatchOnCreate(Dialog.java:355)	at android.app.Dialog.show(Dialog.java:260)	at com.example.hamdaalissaei.final_flah.personal_info$6.onClick(personal_info.java:247)	at android.view.View.performClick(View.java:4204)	at android.view.View$PerformClick.run(View.java:17355)	at android.os.Handler.handleCallback(Handler.java:725)	at android.os.Handler.dispatchMessage(Handler.java:92)	at android.os.Looper.loop(Looper.java:137)	at android.app.ActivityThread.main(ActivityThread.java:5041)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:511)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)	at dalvik.system.NativeStart.main(Native Method)