Notice: Undefined property: DOMDocument::$documentElement in /home/kalkho/domains/kalkhong.com/public_html/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php on line 568

Fatal error: Uncaught Error: Call to a member function getAttributeNS() on null in /home/kalkho/domains/kalkhong.com/public_html/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php:568 Stack trace: #0 /home/kalkho/domains/kalkhong.com/public_html/vendor/symfony/symfony/src/Symfony/Component/Config/Util/XmlUtils.php(83): Symfony\Component\DependencyInjection\Loader\XmlFileLoader->validateSchema(Object(DOMDocument), false) #1 /home/kalkho/domains/kalkhong.com/public_html/vendor/symfony/symfony/src/Symfony/Component/Config/Util/XmlUtils.php(131): Symfony\Component\Config\Util\XmlUtils::parse('<?xml version="...', Array) #2 /home/kalkho/domains/kalkhong.com/public_html/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php(379): Symfony\Component\Config\Util\XmlUtils::loadFile('/home/kalkho/do...', Array) #3 /home/kalkho/domains/kalkhong.com/public_html/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php(44): Symfony in /home/kalkho/domains/kalkhong.com/public_html/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php on line 568