Why does my fingerprint security always shows an error

Everytime I try to use my fingerprint security IT SHOWS AN ERROR MESSAGE THAT TELLS ME IF IT CONTINUES TO OCCUR REBOOT MY PHONE BUT EVEN WEN I REBOOT IT IT DOESN'T HELP THE MATTER, WEN AN APP TELLS ME TO PUT MY FINGER IT TELLS ME INVALID PRINT AND GIVES ME THE 4DIGIT CODE THEN GOES BACK TO THE FINGERPRINT AND REPEATS THE SAME ACTION I HAD TO TURN IT OFF BUT WHEN I TRIED TO TURN IT BACK ON IT TO GIVES AN ERROR MESSAGE

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