Access denied for user 'xxx'@'localhost' (using password: YES) in lock_may_be_avail

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Access denied for user 'xxx'@'localhost' (using password: YES) in lock_may_be_avail

Ciao a tutti,
sito off ricevo questo errore:
PDOException: SQLSTATE[28000] [1045] Access denied for user 'xxx'@'localhost' (using password: YES) in lock_may_be_available() (line 167 of /var/www/vhosts/xxx.xx/httpdocs/includes/lock.inc).

Spero non sia troppo grave :-) qualcuno può darmi un dritta?