java.lang.NullPointerException: println needs a message

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Root Cause Analysis

  1. java.lang.NullPointerException

    println needs a message

    at android.util.Log.println_native()
  2. Android Platform
    Log.d
    1. android.util.Log.println_native(Native Method)
    2. android.util.Log.d(Log.java:139)
    2 frames
  3. com.example.project
    MainActivity$1.onClick
    1. com.example.project.MainActivity.test(MainActivity.java:64)
    2. com.example.project.MainActivity$1.onClick(MainActivity.java:39)
    2 frames
  4. Android Platform
    ActivityThread.main
    1. android.view.View.performClick(View.java:4756)
    2. android.view.View$PerformClick.run(View.java:19761)
    3. android.os.Handler.handleCallback(Handler.java:739)
    4. android.os.Handler.dispatchMessage(Handler.java:95)
    5. android.os.Looper.loop(Looper.java:135)
    6. android.app.ActivityThread.main(ActivityThread.java:5253)
    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:900)
    2. com.android.internal.os.ZygoteInit.main(ZygoteInit.java:695)
    2 frames