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    • java.lang.NullPointerException: Attempt to invoke virtual method '$ApplicationThread' on a null object reference at at at at at appinventor.ai_itiel_maimon.Rubiks_cube.SettingsActivity.restartApp( at appinventor.ai_itiel_maimon.Rubiks_cube.SettingsActivity.access$000( at appinventor.ai_itiel_maimon.Rubiks_cube.SettingsActivity$2.onPreferenceChange( at android.preference.Preference.callChangeListener( at android.preference.ListPreference.onDialogClosed( at android.preference.DialogPreference.onDismiss( at$ListenersHandler.handleMessage( at android.os.Handler.dispatchMessage( at android.os.Looper.loop( at at java.lang.reflect.Method.invoke(Native Method) at$ at

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