Fatal error: Uncaught Error: Class 'Nelmio\ApiDocBundle\Describer\ExternalDocDescriber' not found in /home/itscm/dev.its.cm/webserivesits/vendor/nelmio/api-doc-bundle/Describer/ApiPlatformDescriber.php:18 Stack trace: #0 {main} thrown in /home/itscm/dev.its.cm/webserivesits/vendor/nelmio/api-doc-bundle/Describer/ApiPlatformDescriber.php on line 18