Fatal error: Uncaught Error: Class 'DOMDocument' not found in /home/hennahui/public_html/vendor/magento/framework/Config/Dom.php:377 Stack trace: #0 /home/hennahui/public_html/vendor/magento/framework/Config/Dom.php(109): Magento\Framework\Config\Dom->_initDom('<?xml version="...') #1 /home/hennahui/public_html/vendor/magento/framework/ObjectManager/Config/Reader/Dom.php(70): Magento\Framework\Config\Dom->__construct('<?xml version="...', Object(Magento\Framework\App\Arguments\ValidationState), Array, 'xsi:type', NULL) #2 /home/hennahui/public_html/vendor/magento/framework/Config/Reader/Filesystem.php(146): Magento\Framework\ObjectManager\Config\Reader\Dom->_createConfigMerger('Magento\\Framewo...', '<?xml version="...') #3 /home/hennahui/public_html/vendor/magento/framework/Config/Reader/Filesystem.php(127): Magento\Framework\Config\Reader\Filesystem->_readFiles(Object(Magento\Framework\Config\FileIterator)) #4 /home/hennahui/public_html/vendor/magento/framework/App/ObjectManagerFactory.php(282): Magento\Framework\Config in /home/hennahui/public_html/vendor/magento/framework/Config/Dom.php on line 377