Are you getting these errors in Joomla? Warning: Parameter 1 to modMainMenuHelper::buildXML() expected to be a reference, value given in /home/xx/public_html/libraries/joomla/cache/handler/callback.php on line 99 or Warning: Parameter 1 to HTML_content::show() expected to be a reference, value given in /home/xx/public_html/travel/includes/Cache/Lite/Function.php on line 92 Its because Joomla does not support PHP 5.3 or PHP 5.3.1 Just downgrade your PHP version and these errors will go away Use the following fix as proposed by Alexis in the comments. He says Here is a simple solution to fix it: Open /includes/Cache/Lite/Function.php and replace at line 74: [php firstline="74" title="Editing File includes/Cache/Lite/Function.php"]$arguments = func_get_args();[/php] with: [php firstline="74" title="Editing File includes/Cache/Lite/Function.php" highlight="75,76,77,78,79"]$arguments = func_get_args(); $numargs = func_num_args(); for($i=1; $i < $numargs; $i++){ $arguments[$i] = &$arguments[$i]; } [/php]