Fatal error: Uncaught Error: Class "Metadata\MergeableClassMetadata" not found in /home/activeexcavators/public_html/vendor copy/jms/serializer/src/Metadata/ClassMetadata.php:22 Stack trace: #0 {main} thrown in /home/activeexcavators/public_html/vendor copy/jms/serializer/src/Metadata/ClassMetadata.php on line 22