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.
<br/>
<p><?php echo $row->intro_text;?></p>
<?php if ($this->showIntroText) {?>
<br/>
<p><?php echo $row->intro_text;?></p>
<?php }?>
$this->assign('showTitle', JRequest::getInt('show-title', 1));
$this->assign('showTitle', JRequest::getInt('show-title', 1));
$this->assign('showIntroText', JRequest::getInt('show-introtext', 1));