( ! ) Fatal error: Class 'Symfony\Component\Serializer\Normalizer\ObjectNormalizer' not found in /var/www/clients/client0/web4/web/vendor/symfony/serializer/Tests/Fixtures/StaticConstructorNormalizer.php on line 19
Call Stack
#	Time	Memory	Function	Location
1	0.0000	360816	{main}( )	.../StaticConstructorNormalizer.php:0