PDOException

Hi

I have this error on activate module : PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: SELECT * FROM {l10n_update_file}; Array ( ) in l10n_update_get_history()

and

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] => 1859473056512a13cb3f04e1.06811451 ) in lock_release_all() (line 269 of /home/xxx/public_html/xxx/includes/lock.inc).

any ideas?

thanks.