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: 2006 Server has gone away: SELECT expire, value FROM {semaphore} WHERE name = :name; Array
(
    [:name] =&amp;gt; locale_cache_ro
)
 in lock_may_be_available() (line 167 of /home/revista/public_html/includes/lock.inc).</p><h2>Additional</h2><p>PDOException: SQLSTATE[HY000]: General error: 2006 Server has gone away: SELECT s.lid, t.translation, s.version FROM {locales_source} s LEFT JOIN {locales_target} t ON s.lid = t.lid AND t.language = :language WHERE s.source = :source AND s.context = :context AND s.textgroup = &amp;#039;default&amp;#039;; Array
(
    [:language] =&amp;gt; ro
    [:source] =&amp;gt; %type: !message in %function (line %line of %file).
    [:context] =&amp;gt; 
)
 in locale() (line 719 of /home/revista/public_html/modules/locale/locale.module).</p><hr /><h1>Uncaught exception thrown in shutdown function.</h1><p>PDOException: SQLSTATE[HY000]: General error: 2006 Server has gone away: DELETE FROM {semaphore} 
WHERE  (value = :db_condition_placeholder_0) ; Array
(
    [:db_condition_placeholder_0] =&amp;gt; 14486692506a07c50e8a41a1.33248182
)
 in lock_release_all() (line 269 of /home/revista/public_html/includes/lock.inc).</p><hr />