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

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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$4.onClick(MainActivity.java:209)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)

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