Fatal error: Uncaught Error: Class "Symfony\Component\String\AbstractString" not found in /home/.sites/site4/wwwroot/web/4.0/ui/vendor/symfony/string/AbstractUnicodeString.php:29 Stack trace: #0 {main} thrown in /home/.sites/site4/wwwroot/web/4.0/ui/vendor/symfony/string/AbstractUnicodeString.php on line 29