( ! ) Deprecated: Symfony\Component\Serializer\Normalizer\DateTimeNormalizer::__construct(): Implicitly marking parameter $timezone as nullable is deprecated, the explicit nullable type must be used instead in E:\Program_Files\wamp64\www\print\vendor\symfony\serializer\Normalizer\DateTimeNormalizer.php on line 39

( ! ) Fatal error: Uncaught Error: Interface "Symfony\Component\Serializer\Normalizer\NormalizerInterface" not found in E:\Program_Files\wamp64\www\print\vendor\symfony\serializer\Normalizer\DateTimeNormalizer.php on line 23
( ! ) Error: Interface "Symfony\Component\Serializer\Normalizer\NormalizerInterface" not found in E:\Program_Files\wamp64\www\print\vendor\symfony\serializer\Normalizer\DateTimeNormalizer.php on line 23
Call Stack
#	Time	Memory	Function	Location
1	0.0108	395592	{main}( )	...\DateTimeNormalizer.php:0