( ! ) Deprecated: Symfony\Component\Serializer\Normalizer\ObjectNormalizer::__construct(): Implicitly marking parameter $classMetadataFactory as nullable is deprecated, the explicit nullable type must be used instead in E:\Program_Files\wamp64\www\print\vendor\symfony\serializer\Normalizer\ObjectNormalizer.php on line 37

( ! ) Deprecated: Symfony\Component\Serializer\Normalizer\ObjectNormalizer::__construct(): Implicitly marking parameter $nameConverter as nullable is deprecated, the explicit nullable type must be used instead in E:\Program_Files\wamp64\www\print\vendor\symfony\serializer\Normalizer\ObjectNormalizer.php on line 37

( ! ) Deprecated: Symfony\Component\Serializer\Normalizer\ObjectNormalizer::__construct(): Implicitly marking parameter $propertyAccessor as nullable is deprecated, the explicit nullable type must be used instead in E:\Program_Files\wamp64\www\print\vendor\symfony\serializer\Normalizer\ObjectNormalizer.php on line 37

( ! ) Deprecated: Symfony\Component\Serializer\Normalizer\ObjectNormalizer::__construct(): Implicitly marking parameter $propertyTypeExtractor as nullable is deprecated, the explicit nullable type must be used instead in E:\Program_Files\wamp64\www\print\vendor\symfony\serializer\Normalizer\ObjectNormalizer.php on line 37

( ! ) Deprecated: Symfony\Component\Serializer\Normalizer\ObjectNormalizer::__construct(): Implicitly marking parameter $classDiscriminatorResolver as nullable is deprecated, the explicit nullable type must be used instead in E:\Program_Files\wamp64\www\print\vendor\symfony\serializer\Normalizer\ObjectNormalizer.php on line 37

( ! ) Deprecated: Symfony\Component\Serializer\Normalizer\ObjectNormalizer::__construct(): Implicitly marking parameter $objectClassResolver as nullable is deprecated, the explicit nullable type must be used instead in E:\Program_Files\wamp64\www\print\vendor\symfony\serializer\Normalizer\ObjectNormalizer.php on line 37

( ! ) Fatal error: Uncaught Error: Class "Symfony\Component\Serializer\Normalizer\AbstractObjectNormalizer" not found in E:\Program_Files\wamp64\www\print\vendor\symfony\serializer\Normalizer\ObjectNormalizer.php on line 29
( ! ) Error: Class "Symfony\Component\Serializer\Normalizer\AbstractObjectNormalizer" not found in E:\Program_Files\wamp64\www\print\vendor\symfony\serializer\Normalizer\ObjectNormalizer.php on line 29
Call Stack
#	Time	Memory	Function	Location
1	0.0145	399272	{main}( )	...\ObjectNormalizer.php:0