THE MESSAGE "PLEASE WAIT" WON'T COME OFF THE SCREEN.

I WAS USING THE CAMARA AND IT WAS PLUGGED IN, BUT I DECIDED TO PLUG IT IN SOMEWHERE ELSE AND UNPLUGGED IT. WHEN I PLUGGED IT IN AGAIN AND TRIED TO USE IT THE MESSAGE "PLEASE WAIT" APPEARED AND WON'T COME OFF.HOW CAN I MAKE IT COME OFF?

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