Activation issue

On activating this module, I'm getting an error...

Additional uncaught exception thrown while handling exception.

Original

PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: SELECT r.filename AS filename FROM {registry} r WHERE (r.name LIKE :db_condition_placeholder_0 ESCAPE '\\') AND (r.type = :db_condition_placeholder_1) ; Array ( [:db_condition_placeholder_0] => SlickUi [:db_condition_placeholder_1] => trait ) in _registry_check_code() (line 3505 of /var/www/vhosts/dev/includes/bootstrap.inc).

Additional

PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: SELECT r.filename AS filename FROM {registry} r WHERE (r.name LIKE :db_condition_placeholder_0 ESCAPE '\\') AND (r.type = :db_condition_placeholder_1) ; Array ( [:db_condition_placeholder_0] => context\_reaction\_theme\_html [:db_condition_placeholder_1] => trait ) in _registry_check_code() (line 3505 of /var/www/vhosts/dev/includes/bootstrap.inc).

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] => 2967689835cee9702281113.64051956 ) in lock_release_all() (line 269 of /var/www/vhosts/dev/includes/lock.inc).

I'm running this module on other similarly setup sites with no problems...

Disabling the module fixes it, but I've no idea why it won't activate.

Thanks,
Eric