Fatal error: Uncaught Error: Class "Symfony\Component\String\AbstractUnicodeString" not found in /home/.sites/site4/wwwroot/web/4.0/ui/vendor/symfony/string/UnicodeString.php:33 Stack trace: #0 {main} thrown in /home/.sites/site4/wwwroot/web/4.0/ui/vendor/symfony/string/UnicodeString.php on line 33