java.lang.NullPointerException: Attempt to invoke virtual method ‘java.lang.String java.lang.String.toString()’ on a null object reference

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    java.lang.RuntimeException: Unable to resume activity {com.example.project/com.example.project.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.String.toString()' on a null object reference

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    Root Cause Analysis

    1. java.lang.NullPointerException

      Attempt to invoke virtual method ‘java.lang.String java.lang.String.toString()’ on a null object reference

      at com.example.dts.imageupload.MainActivity$2.onErrorResponse()
    2. com.example.dts
      MainActivity$2.onErrorResponse
      1. com.example.dts.imageupload.MainActivity$2.onErrorResponse(MainActivity.java:97)
      1 frame
    3. Android-Volley Library
      ExecutorDelivery$ResponseDeliveryRunnable.run
      1. com.android.volley.Request.deliverError(Request.java:524)
      2. com.android.volley.ExecutorDelivery$ResponseDeliveryRunnable.run(ExecutorDelivery.java:101)
      2 frames
    4. Android Platform
      ActivityThread.main
      1. android.os.Handler.handleCallback(Handler.java:739)
      2. android.os.Handler.dispatchMessage(Handler.java:95)
      3. android.os.Looper.loop(Looper.java:139)
      4. android.app.ActivityThread.main(ActivityThread.java:5298)
      4 frames
    5. Java RT
      Method.invoke
      1. java.lang.reflect.Method.invoke(Native Method)
      2. java.lang.reflect.Method.invoke(Method.java:372)
      2 frames
    6. Android
      ZygoteInit.main
      1. com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:950)
      2. com.android.internal.os.ZygoteInit.main(ZygoteInit.java:745)
      2 frames