java.lang.NullPointerException: string == null

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    Root Cause Analysis

    1. java.lang.NullPointerException

      string == null

      at java.util.StringTokenizer.<init>()
    2. Java RT
      StringTokenizer.<init>
      1. java.util.StringTokenizer.<init>(StringTokenizer.java:95)
      2. java.util.StringTokenizer.<init>(StringTokenizer.java:75)
      2 frames
    3. com.example.sumittifane
      MainActivity.onClick
      1. com.example.sumittifane.emoextraction.MainActivity.onClick(MainActivity.java:54)
      1 frame
    4. Android Platform
      ActivityThread.main
      1. android.view.View.performClick(View.java:4802)
      2. android.view.View$PerformClick.run(View.java:20102)
      3. android.os.Handler.handleCallback(Handler.java:810)
      4. android.os.Handler.dispatchMessage(Handler.java:99)
      5. android.os.Looper.loop(Looper.java:189)
      6. android.app.ActivityThread.main(ActivityThread.java:5529)
      6 frames
    5. Java RT
      Method.invoke
      1. java.lang.reflect.Method.invoke(Native Method)
      2. java.lang.reflect.Method.invoke(Method.java:372)
      2 frames
    6. Android
      ZygoteInit.main
      1. com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:950)
      2. com.android.internal.os.ZygoteInit.main(ZygoteInit.java:745)
      2 frames