( ! ) Deprecated: Symfony\Component\Serializer\Mapping\AttributeMetadata::setSerializedName(): Implicitly marking parameter $serializedName as nullable is deprecated, the explicit nullable type must be used instead in E:\Program_Files\wamp64\www\print\vendor\symfony\serializer\Mapping\AttributeMetadata.php on line 103

( ! ) Fatal error: Uncaught Error: Interface "Symfony\Component\Serializer\Mapping\AttributeMetadataInterface" not found in E:\Program_Files\wamp64\www\print\vendor\symfony\serializer\Mapping\AttributeMetadata.php on line 19
( ! ) Error: Interface "Symfony\Component\Serializer\Mapping\AttributeMetadataInterface" not found in E:\Program_Files\wamp64\www\print\vendor\symfony\serializer\Mapping\AttributeMetadata.php on line 19
Call Stack
#	Time	Memory	Function	Location
1	0.0231	377888	{main}( )	...\AttributeMetadata.php:0