this means that you’re currently using the Greenbone Source Edition (GSE) and not the Greenbone Community Edition (GCE). I have moved this topic to the correct category for now.
This most likely means that you’re using outdated versions of the GVM components. Please compare your versions with the recent ones of GVM-9 (end-of-life, initial release 2017-03-07) - Greenbone Community Edition - Greenbone Community Forum and update these accordingly if they differ.