Long press navigation or menu button,if there are existing application running or unwanted application,navigate that apps and just press c to exit or close that application.this may happen when you open an apps and do not close the apps properly then open a new one,this error takes place. If does not work,you need to format the phone to remove the unwanted running application on your system,just type *#7370# on your home screen,a lock code will be ask then enter your preferred code if change before, or 12345 as the default code,be sure to back up all of your data before doing this method.
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