Fatal error: Uncaught Error: Interface "Symfony\Component\Serializer\Encoder\EncoderInterface" not found in C:\Apache24\htdocs\cms_upgrade\vendor\symfony\serializer\Encoder\JsonEncode.php:21
Stack trace:
#0 {main}
thrown in C:\Apache24\htdocs\cms_upgrade\vendor\symfony\serializer\Encoder\JsonEncode.php on line 21