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Attempt to invoke virtual method 'android.app.ActivityThread$ApplicationThread android.app.ActivityThread.getApplicationThread()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'android.app.ActivityThread$ApplicationThread android.app.ActivityThread.getApplicationThread()' on a null object reference at android.app.Activity.startActivityForResult(Activity.java:4283) at android.app.Activity.startActivityForResult(Activity.java:4230) at android.app.Activity.startActivity(Activity.java:4567) at android.app.Activity.startActivity(Activity.java:4535) at appinventor.ai_itiel_maimon.Rubiks_cube.SettingsActivity.restartApp(SettingsActivity.java:59) at appinventor.ai_itiel_maimon.Rubiks_cube.SettingsActivity.access$000(SettingsActivity.java:16) at appinventor.ai_itiel_maimon.Rubiks_cube.SettingsActivity$2.onPreferenceChange(SettingsActivity.java:50) at android.preference.Preference.callChangeListener(Preference.java:1173) at android.preference.ListPreference.onDialogClosed(ListPreference.java:282) at android.preference.DialogPreference.onDismiss(DialogPreference.java:424) at android.app.Dialog$ListenersHandler.handleMessage(Dialog.java:1533) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:158) at android.app.ActivityThread.main(ActivityThread.java:7229) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)