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
Please see our announcement here.
i am having a blank page too after i clicked "Install Sample Data"
i just found out this component today and it seems to be what i been looking for so i decided to give it a try.
anyone please ?
Problem solved by increasing max_execution_time to 120 seconds in php.ini