Additional uncaught exception thrown while handling exception.

<h1>Additional uncaught exception thrown while handling exception.</h1><h2>Original</h2><p>PDOException: SQLSTATE[HY000]: General error: 2013 Lost connection to MySQL server during query: SELECT filename FROM {registry} WHERE name = :name AND type = :type; Array
(
    [:name] =&amp;gt; Memcached
    [:type] =&amp;gt; interface
)
 in _registry_check_code() (line 3015 of /var/www/www-root/data/www/fightnews.ru/includes/bootstrap.inc).</p><h2>Additional</h2><p>PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: SELECT filename FROM {registry} WHERE name = :name AND type = :type; Array
(
    [:name] =&amp;gt; Memcached
    [:type] =&amp;gt; interface
)
 in _registry_check_code() (line 3015 of /var/www/www-root/data/www/fightnews.ru/includes/bootstrap.inc).</p><hr />