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java.lang.NullPointerException: 	at com.example.lananh.da_quanlychitieu.ThuFragment.refreshListview(ThuFragment.java:338)	at com.example.lananh.da_quanlychitieu.MainActivity.Add_new_thu(MainActivity.java:248)	at com.example.lananh.da_quanlychitieu.MainActivity$4.onClick(MainActivity.java:209)	at android.support.v7.app.AlertController$ButtonHandler.handleMessage(AlertController.java:157)	at android.os.Handler.dispatchMessage(Handler.java:99)	at android.os.Looper.loop(Looper.java:137)	at android.app.ActivityThread.main(ActivityThread.java:5103)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:525)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)	at dalvik.system.NativeStart.main(Native Method)