Fatal error: Uncaught Error: Class "Symfony\Component\String\AbstractString" not found in C:\apache24\htdocs\rccm\portailWeb\vendor\symfony\string\AbstractUnicodeString.php:29 Stack trace: #0 {main} thrown in C:\apache24\htdocs\rccm\portailWeb\vendor\symfony\string\AbstractUnicodeString.php on line 29