Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'custom_canonical_init' not found or invalid function name in /volume1/web/piwigo/include/functions_plugins.inc.php on line 264

Fatal error: Uncaught  --> Smarty: Unable to load template 'file:menubar_related_categories.tpl' in 'menubar.tpl' <-- 
  thrown in /volume1/web/piwigo/include/smarty/libs/sysplugins/smarty_internal_template.php on line 196