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
See Announcement
We have resolved the issue with the J! updater and this will be fixed in the next release.
var mything = jQuery('.mySelector').closest('someOtherSelector');
$db = JFactory::getDBO();
$query = $db->getQuery(true);
$query->select('COUNT(DISTINCT `Sezione`) as tot')->from('tm_schede')->where('id_allen=' . $db->quote('{tm_allenamenti___id}'));
$db->setQuery($query);
return $db->loadResult();