Fatal error: Uncaught Error: Class "JMS\Serializer\Tests\Fixtures\Discriminator\ObjectWithXmlNamespaceAttributeDiscriminatorParent" not found in /home/kiwakim/stock/vendor/jms/serializer/tests/Fixtures/Discriminator/ObjectWithXmlNamespaceAttributeDiscriminatorChild.php:5 Stack trace: #0 {main} thrown in /home/kiwakim/stock/vendor/jms/serializer/tests/Fixtures/Discriminator/ObjectWithXmlNamespaceAttributeDiscriminatorChild.php on line 5