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
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We have resolved the issue with the J! updater and this will be fixed in the next release.
The error occurs when I try to create a new item from a list
The error occurs when I try to create a new item from a list
when I click on new
Fatal error: Cannot declare class FabimageHelper, because the name is already in use in /var/www/html/components/com_fabrik/helpers/image.php on line 23
One thing you could try is renaming that ./components/com_fabrik/helpers/image.php to something else (just add .not on the end or something), then try again. That should give us an error telling us which file is trying to require it.
-- hugh