ERROR 1396 (HY000): Operation CREATE USER failed for ‘jack’@’localhost’

Try doing a FLUSH PRIVILEGES;. This MySQL bug post on that error code appears to report some success in a case similar to yours after flushing privs. 

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)