Doing anything in the wiki results in the following "warning" and reports "Internal error" in the page header.

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'efSyntaxHighlight_GeSHiSetup' not found or invalid function name in /home/opengl/public_html/wiki_132/includes/Hooks.php on line 216 [e70681cb] 2013-05-02 09:34:06: Fatal exception of type MWException

Helps!