Fatal error: Uncaught Error: Class "OpenCloud\Common\Resource\PersistentResource" not found in /app/vendor/rackspace/php-opencloud/lib/OpenCloud/LoadBalancer/Resource/CertificateMapping.php:28 Stack trace: #0 {main} thrown in /app/vendor/rackspace/php-opencloud/lib/OpenCloud/LoadBalancer/Resource/CertificateMapping.php on line 28