Hi, not sure on which Booktype instance (URL) you are? It looks like no role has been created yet. You can invite someone only with a specific role like "co-editor", "proof reader" etc. If there are no roles defined there are infomration missing when you try to generate the code since the list of roles to chose from of is empty...
Post edited by Julian Sorge at 2017-09-28 01:59:14