( ! ) Deprecated: Symfony\Component\DependencyInjection\Dumper\YamlDumper::getServiceCall(): Implicitly marking parameter $reference as nullable is deprecated, the explicit nullable type must be used instead in E:\Program_Files\wamp64\www\print\vendor\symfony\dependency-injection\Dumper\YamlDumper.php on line 285

( ! ) Fatal error: Uncaught Error: Class "Symfony\Component\DependencyInjection\Dumper\Dumper" not found in E:\Program_Files\wamp64\www\print\vendor\symfony\dependency-injection\Dumper\YamlDumper.php on line 37
( ! ) Error: Class "Symfony\Component\DependencyInjection\Dumper\Dumper" not found in E:\Program_Files\wamp64\www\print\vendor\symfony\dependency-injection\Dumper\YamlDumper.php on line 37
Call Stack
#	Time	Memory	Function	Location
1	0.0224	432400	{main}( )	...\YamlDumper.php:0