Forums / Cotonti / Support / Rewrite URLs

Callbacks are custom functions which are called when generating the urls. E.g. {page_url_structure()} is replaced with result of page_url_structure(&$args), where page_url_structure() is a custom user-defined function. Those functions you're missing are contained in an extra include file.

Also the warnings "Rule contains callbacks" means that URL designer tool doesn't have so much Artificial Intelligence to write .htaccess rules for them, so you have to make .htaccess rules for callbacks by hand.