( ! ) Deprecated: Symfony\Component\Serializer\Encoder\YamlEncoder::__construct(): Implicitly marking parameter $dumper as nullable is deprecated, the explicit nullable type must be used instead in E:\Program_Files\wamp64\www\print\vendor\symfony\serializer\Encoder\YamlEncoder.php on line 32

( ! ) Deprecated: Symfony\Component\Serializer\Encoder\YamlEncoder::__construct(): Implicitly marking parameter $parser as nullable is deprecated, the explicit nullable type must be used instead in E:\Program_Files\wamp64\www\print\vendor\symfony\serializer\Encoder\YamlEncoder.php on line 32

( ! ) Fatal error: Uncaught Error: Interface "Symfony\Component\Serializer\Encoder\EncoderInterface" not found in E:\Program_Files\wamp64\www\print\vendor\symfony\serializer\Encoder\YamlEncoder.php on line 23
( ! ) Error: Interface "Symfony\Component\Serializer\Encoder\EncoderInterface" not found in E:\Program_Files\wamp64\www\print\vendor\symfony\serializer\Encoder\YamlEncoder.php on line 23
Call Stack
#	Time	Memory	Function	Location
1	0.0016	376824	{main}( )	...\YamlEncoder.php:0