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.
Works OK for me:
http://screencast.com/t/Bx4A8e4b
You don't have to set the "internalid" element type on your ID field, but it's recommended.
Also, don't try setting that date field to a 'date' element, as it won't import. When importing dates into a newly created list, they have to be in the standard MySQL format (Y-m-d H:i:s).
-- hugh