java.lang.RuntimeException: An error occurred while executing doInBackground()

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    Root Cause Analysis

    1. java.lang.NullPointerException

      Attempt to invoke virtual method 'void android.app.AlertDialog.setMessage(java.lang.CharSequence)' on a null object reference

      at com.example.steven.database.DownloadGS.doInBackground()
    2. com.example.steven
      DownloadGS.doInBackground
      1. com.example.steven.database.DownloadGS.doInBackground(DownloadGS.java:95)
      2. com.example.steven.database.DownloadGS.doInBackground(DownloadGS.java:49)
      2 frames
    3. Android Platform
      AsyncTask$2.call
      1. android.os.AsyncTask$2.call(AsyncTask.java:295)
      1 frame
    4. Java RT
      FutureTask.run
      1. java.util.concurrent.FutureTask.run(FutureTask.java:237)
      1 frame