Fatal error: Uncaught Error: Interface "Lcobucci\JWT\Validator" not found in I:\www\oauth2\auth_server\vendor\lcobucci\jwt\src\Validation\Validator.php:8 Stack trace: #0 {main} thrown in I:\www\oauth2\auth_server\vendor\lcobucci\jwt\src\Validation\Validator.php on line 8