برنامج الماجستير

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Uncaught exception thrown in shutdown function.

PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: DELETE FROM {semaphore} WHERE (value = :db_condition_placeholder_0) ; Array ( [:db_condition_placeholder_0] => 589559687609f2d8f9b0085.79102440 ) in lock_release_all() (line 269 of /var/www/ppu.edu/bio/includes/lock.inc).