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(65): 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