Fatal error: Uncaught Error: Interface "Symfony\Component\Serializer\Normalizer\NormalizerInterface" not found in C:\Apache24\htdocs\cms_upgrade\vendor\symfony\serializer\Normalizer\ProblemNormalizer.php:25
Stack trace:
#0 {main}
thrown in C:\Apache24\htdocs\cms_upgrade\vendor\symfony\serializer\Normalizer\ProblemNormalizer.php on line 25