Fatal error: Uncaught Error: Class 'DOMDocument' not found in /srv/apps/wordpress/releases/20180705144851/wp-content/plugins/accelerated-mobile-pages/includes/vendor/amp/includes/utils/class-amp-dom-utils.php:54 Stack trace: #0 /srv/apps/wordpress/releases/20180705144851/wp-content/plugins/accelerated-mobile-pages/includes/vendor/amp/includes/utils/class-amp-dom-utils.php(313): AMP_DOM_Utils::get_dom('<html><head><me...') #1 /srv/apps/wordpress/releases/20180705144851/wp-content/plugins/accelerated-mobile-pages/includes/vendor/amp/includes/class-amp-content.php(106): AMP_DOM_Utils::get_dom_from_content('<h1>Unpacking R...') #2 /srv/apps/wordpress/releases/20180705144851/wp-content/plugins/accelerated-mobile-pages/includes/vendor/amp/includes/class-amp-content.php(93): AMP_Content_Sanitizer::sanitize('<h1>Unpacking R...', Array, Array) #3 /srv/apps/wordpress/releases/20180705144851/wp-content/plugins/accelerated-mobile-pages/includes/vendor/amp/includes/class-amp-content.php(54): AMP_Content->sanitize('<h1>Unpacking R...') in /srv/apps/wordpress/releases/20180705144851/wp-content/plugins/accelerated-mobile-pages/includes/vendor/amp/includes/utils/class-amp-dom-utils.php on line 54