java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.whiteboard/com.example.whiteboard.SignedIn}: java.lang.NullPointerException

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Root Cause Analysis

  1. java.lang.NullPointerException

    No message provided

    at android.app.Activity.findViewById()
  2. Android Platform
    Activity.findViewById
    1. android.app.Activity.findViewById(Activity.java:1884)
    1 frame
  3. com.example.whiteboard
    SignedIn.<init>
    1. com.example.whiteboard.SignedIn.<init>(SignedIn.java:25)
    1 frame
  4. Java RT
    Class.newInstance
    1. java.lang.Class.newInstanceImpl(Native Method)
    2. java.lang.Class.newInstance(Class.java:1208)
    2 frames
  5. Android Platform
    ActivityThread.main
    1. android.app.Instrumentation.newActivity(Instrumentation.java:1061)
    2. android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2112)
    3. android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
    4. android.app.ActivityThread.access$800(ActivityThread.java:135)
    5. android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
    6. android.os.Handler.dispatchMessage(Handler.java:102)
    7. android.os.Looper.loop(Looper.java:136)
    8. android.app.ActivityThread.main(ActivityThread.java:5017)
    8 frames
  6. Java RT
    Method.invoke
    1. java.lang.reflect.Method.invokeNative(Native Method)
    2. java.lang.reflect.Method.invoke(Method.java:515)
    2 frames
  7. Android
    ZygoteInit.main
    1. com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
    2. com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
    2 frames
  8. Android Platform
    NativeStart.main
    1. dalvik.system.NativeStart.main(Native Method)
    1 frame