在活动组内放置微调器和日期选择器时出错

ERROR/AndroidRuntime(474): android.view.WindowManager$BadTokenException: Unable to add window -- token android.app.LocalActivityManager$LocalActivityRecord@43791b18 is not valid; is your activity running?

View viewToLoad = LayoutInflater.from(this.getParent()).inflate(R.layout.rem_data2, null);
setContentView(viewToLoad);

ERROR/AndroidRuntime(474): android.view.WindowManager$BadTokenException: Unable to add window -- token android.app.LocalActivityManager$LocalActivityRecord@43791b18 is not valid; is your activity running?

 switch (id) {
 case DATE_DIALOG_ID:
     return new DatePickerDialog(getParent(),
                 mDateSetListener,
                 mYear, mMonth, mDay);
 case DATE_DIALOG_ID_RETURN:
     return new DatePickerDialog(getParent(),
       mDateSetListenerreturn,
                 mYear, mMonth, mDay);     
 }