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.
$myAge = (int)'{mylist___age_raw}';
if ($myAge <= 30) {
return 'colgreen';
}
else if ($age <= 60) {
return 'colyellow';
}
else {
return 'colred';
}