Hi: There are at least two users of Shondali extensions with conflicts within HelixUltimate. Please echeck:

This is caused by your template override files.

JROOT/plugins/system/helixultimate/overrides/layouts/joomla/form/field/user.php or

JROOT/templates/j-network/html/layouts/joomla/edit/publishingdata.php

Click on view source and you can see the full stack trace of that exception. Community Answers do not have any references to the above deprecated method.

Hope this could be fixed. Otherwise probably will have to look for other template provider.

Thanks