Проблема Ошибки Strict Standards: Only variables should be assigned by reference

Здравствуйте уважаемые специалисты по Joomla. На версии 2.5 после переноса на впс появились такие вот ошибки:
Strict Standards: Only variables should be assigned by reference in /plugins/system/jsecure/jsecure.php on line 19
Strict Standards: Only variables should be assigned by reference in /plugins/system/jsecure/jsecure.php on line 66
Strict Standards: Only variables should be assigned by reference in /plugins/system/jsecure/jsecure.php on line 138
Strict Standards: Non-static method JSite::getMenu() should not be called statically, assuming $this from incompatible context in /templates/chudo/index.php on line 6
Strict Standards: Non-static method JApplication::getMenu() should not be called statically, assuming $this from incompatible context in /includes/application.php on line 536

В первой строке $lang =& JFactory::getLanguage();
Во второй $app =& JFactory::getApplication();
В третьей $document =& JFactory::getDocument();
В четвертой $menu = JSite::getMenu();
В пятой $menu = parent::getMenu('site', $options);

Помогите пожалуйста разобраться в чем проблема