Per [aMiSTACX] using PHP 7.1 you may get an error like this after a system update/upgrade: Uncaught Error: Class ‘DOMDocument’ not found in /var/www/magento/vendor/magento/framework/Config/Dom.php:384… The browser will report a 500 error, but the Apache logs will show more details. The fix is really simple. From CLI: sudo a2dismod php7.2 sudo service apache2 restart Note: Make… Continue reading Magento 2 – Uncaught Error: Class ‘DOMDocument’