Fatal error: Uncaught Error: Class "DOMDocument" not found in /home/backrtri/public_html/vendor/magento/framework/Config/Dom.php:449 Stack trace: #0 /home/backrtri/public_html/vendor/magento/framework/Config/Dom.php(114): Magento\Framework\Config\Dom->_initDom() #1 /home/backrtri/public_html/vendor/magento/framework/ObjectManager/Config/Reader/Dom.php(70): Magento\Framework\Config\Dom->__construct() #2 /home/backrtri/public_html/vendor/magento/framework/Config/Reader/Filesystem.php(151): Magento\Framework\ObjectManager\Config\Reader\Dom->_createConfigMerger() #3 /home/backrtri/public_html/vendor/magento/framework/Config/Reader/Filesystem.php(132): Magento\Framework\Config\Reader\Filesystem->_readFiles() #4 /home/backrtri/public_html/vendor/magento/framework/App/ObjectManagerFactory.php(279): Magento\Framework\Config\Reader\Filesystem->read() #5 /home/backrtri/public_html/vendor/magento/framework/App/ObjectManagerFactory.php(140): Magento\Framework\App\ObjectManagerFactory->_loadPrimaryConfig() #6 /home/backrtri/public_html/vendor/magento/framework/App/Bootstrap.php(212): Magento\Framework\App\ObjectManagerFactory->create() #7 /home/backrtri/public_html/vendor/magento/framework/App/Bootstrap.php(127): Magento\Framework\App\Bootstrap->__construct() #8 /home/backrtri/public_html/pub/index.php(31): Magento\Framework\App\Bootstrap::create() #9 {main} thrown in /home/backrtri/public_html/vendor/magento/framework/Config/Dom.php on line 449