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./othercms/xenForo 2.2.8/src/XF/Install/_templates/upgrade_errors.php
<?php
    class_exists
('XF\Install\App', false) || die('Invalid');

   
$templater->setTitle('Upgrade errors');
?>

<div class="blockMessage blockMessage--error">
    Uh oh, your upgrade to <?php echo htmlspecialchars(\XF::$version); ?> has failed! The following elements of the database are incorrect:
    <ul>
        <?php foreach ($errors AS $error) { ?>
           <li><?php echo $error; ?></li>
        <?php } ?>
   </ul>
    This is likely caused by an add-on conflict. You may need to restore a backup, remove the offending add-on data from the database, and retry the upgrade. Contact support if you are not sure how to proceed.
</div>