Fatal error: Uncaught Error: Class 'DOMImplementation' not found in /var/www/html/amp/vendor/masterminds/html5/src/HTML5/Parser/DOMTreeBuilder.php:172 Stack trace: #0 /var/www/html/amp/vendor/masterminds/html5/src/HTML5.php(157): Masterminds\HTML5\Parser\DOMTreeBuilder->__construct() #1 /var/www/html/amp/vendor/masterminds/html5/src/HTML5.php(89): Masterminds\HTML5->parse() #2 /var/www/html/amp/vendor/magyarandras/amp-converter/src/Converter.php(147): Masterminds\HTML5->loadHTML() #3 /var/www/html/amp/index.php(60): magyarandras\AMPConverter\Converter->convert() #4 {main} thrown in /var/www/html/amp/vendor/masterminds/html5/src/HTML5/Parser/DOMTreeBuilder.php on line 172