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.
$parentGroups = array();
foreach ($parent as $parentGroup)
{
$group = $this->domNodeAttributesToArray($parentGroup);
$parentGroups[] = $group;
}
if ($parent[0]->getAttribute('ignoreacl') === 'true')
if ($parentGroups[0]['ignoreacl'] === 'true')