java.lang.NullPointerException: Attempt to invoke virtual method 'android.app.ActivityThread$ApplicationThread android.app.ActivityThread.getApplicationThread()' on a null object reference

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    java.lang.NullPointerException: Attempt to invoke virtual method 'android.app.ActivityThread$ApplicationThread android.app.ActivityThread.getApplicationThread()' on a null object reference
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    java.lang.NullPointerException: Attempt to invoke virtual method 'android.app.ActivityThread$ApplicationThread android.app.ActivityThread.getApplicationThread()' on a null object reference
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Root Cause Analysis

  1. java.lang.NullPointerException

    Attempt to invoke virtual method 'android.app.ActivityThread$ApplicationThread android.app.ActivityThread.getApplicationThread()' on a null object reference

    at android.app.Activity.startActivityForResult()
  2. Android Platform
    Activity.startActivity
    1. android.app.Activity.startActivityForResult(Activity.java:4283)
    2. android.app.Activity.startActivityForResult(Activity.java:4230)
    3. android.app.Activity.startActivity(Activity.java:4567)
    4. android.app.Activity.startActivity(Activity.java:4535)
    4 frames
  3. appinventor.ai_itiel_maimon.Rubiks_cube
    SettingsActivity$2.onPreferenceChange
    1. appinventor.ai_itiel_maimon.Rubiks_cube.SettingsActivity.restartApp(SettingsActivity.java:59)
    2. appinventor.ai_itiel_maimon.Rubiks_cube.SettingsActivity.access$000(SettingsActivity.java:16)
    3. appinventor.ai_itiel_maimon.Rubiks_cube.SettingsActivity$2.onPreferenceChange(SettingsActivity.java:50)
    3 frames
  4. Android Platform
    ActivityThread.main
    1. android.preference.Preference.callChangeListener(Preference.java:1173)
    2. android.preference.ListPreference.onDialogClosed(ListPreference.java:282)
    3. android.preference.DialogPreference.onDismiss(DialogPreference.java:424)
    4. android.app.Dialog$ListenersHandler.handleMessage(Dialog.java:1533)
    5. android.os.Handler.dispatchMessage(Handler.java:102)
    6. android.os.Looper.loop(Looper.java:158)
    7. android.app.ActivityThread.main(ActivityThread.java:7229)
    7 frames
  5. Java RT
    Method.invoke
    1. java.lang.reflect.Method.invoke(Native Method)
    1 frame
  6. Android
    ZygoteInit.main
    1. com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
    2. com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
    2 frames