Fatal error: Uncaught Error: Class "Symfony\Component\String\AbstractString" not found in D:\Apache24\www\pesticide\备份\pesticide-back-end_bf\vendor\symfony\string\AbstractUnicodeString.php:29 Stack trace: #0 {main} thrown in D:\Apache24\www\pesticide\备份\pesticide-back-end_bf\vendor\symfony\string\AbstractUnicodeString.php on line 29