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Error message

PDOException: SQLSTATE[40001]: Serialization failure: 1213 Deadlock found when trying to get lock; try restarting transaction: DELETE FROM {semaphore} WHERE (name = :db_condition_placeholder_0) AND (value = :db_condition_placeholder_1) ; Array ( [:db_condition_placeholder_0] => variable_init [:db_condition_placeholder_1] => 141616117665f8f536a4acb3.80876914 ) in lock_release() (line 254 of /mnt/xvdf1/www/html/tiff/web/includes/lock.inc).