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Hello. I wanted to set up a prestashop for the subdomain of the website where I use Prestashop. I downloaded prestashop version 1.7.6.8 to clean install. There was no problem until I installed it. But after installing Prestashop, I cannot enter the store. I can log into the back office without any problems. But I can not login to the site. php.ini and .htaccess settings were made. I could not understand what is wrong.

Error:

Notice: Undefined property: DOMDocument::$documentElement in /home2/x/su.x.com/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php on line 579

Fatal error: Uncaught Error: Call to a member function getAttributeNS() on null in /home2/x/su.x.com/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php:579 Stack trace: #0 /home2/x/su.x.com/vendor/symfony/symfony/src/Symfony/Component/Config/Util/XmlUtils.php(83): Symfony\Component\DependencyInjection\Loader\XmlFileLoader->validateSchema(Object(DOMDocument), false) #1 /home2/x/su.x.com/vendor/symfony/symfony/src/Symfony/Component/Config/Util/XmlUtils.php(131): Symfony\Component\Config\Util\XmlUtils::parse('<?xml version="...', Array) #2 /home2/x/su.x.com/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php(384): Symfony\Component\Config\Util\XmlUtils::loadFile('/home2/modifero...', Array) #3 /home2/x/su.x.com/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php(44): Symfony\Component\DependencyInjection\Loader\XmlFileLoader->parseFileToDOM('/ in /home2/x/su.x.com/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Loader/XmlFileLoader.php on line 579

XML is active in phpinfo ().

Everything is suitable in prestainfo. My main domain is already working normally. But there is such a problem in my sub domain. How can I solve it?