This error occurs sometimes when creating/uninstalling custom entities in drupal 8 or 9. Solution The error occurs when you try to create an entity that extends: EditorialContentEntityType When using one of these, you must user revisions. Thus then you need to add: * revision_metadata_keys = { * "revision_user" = "revision_user", * "revision_created" = "revision_created", * "revision_log_message" = "revision_log" * }, To your entity annotations. If you don't want to use revisions, you should extend ContentEntityBase But you should know that you can't use things like workflows, because these require revisions. Tags Drupal 8