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

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

<div class="blockMessage blockMessage--error">
    <p>Uh oh, your upgrade to <?php echo htmlspecialchars(\XF::$version); ?> has failed!
        The upgrade rebuild processes did not complete successfully.</p>

    <p>Use the button below to try again. If you receive this error again, please contact support.</p>

    <a href="index.php?upgrade/rebuild" class="button">Retry now</a>
</div>