We have now opened a commercial services section here on the forum for registered users. If you have a Fabrik project that you wish to have someone work on for you, post it under Help Wanted. If you are an application developer and wish to earn some money helping others, post your details under Fabrik Application Developers.
Both of these are unmoderated. It will be up to both parties to work out the details and come to an agreement.
For running J!5.1 you must https://fabrikar.com/forums/index.php?wiki/update-from-github/ or include the new file manually https://fabrikar.com/forums/index.php?threads/joomla-5-1-and-fabrik-cannot-find-files-error.54473/post-285151 See also Announcements
But anyway...Front end testing templates were Cassiopeia and to a lesser extent Helix Ultimate. Admin testing template on Atum. At this time we do not want to get into any issues with other templates.
As I assumed: Obviously you have a Fabrik3 override in your Gantry template.1 () JROOT/templates/g5_hydrogen/html/layouts/com_fabrik/element/fabrik-element-label.php:7
If it's this error it's an override.1 () JROOT/templates/g5_hydrogen/html/layouts/com_fabrik/element/fabrik-element-label.php:7