The syndication module on my site is not displaying a working RSS reed. Instead it provides this error message: "CALL TO UNDEFINED METHOD JOOMLA\CMS\DOCUMENT\FEEDDOCUMENT::ADDHEADLINK()"
It looks as though this is an issue related to the template, which I have now fully updated alongside my Joomla install. This has not fixed the issue.
Is there a way to fix the RSS feeds?