Therefore we had to use invoicing with corresponding wpinv-affiliatewp which has worked so far. As I can remember after the latest update from main affiliate wp they have changed some database structure to be updated on their latest upgrade.
So I guess this message has to do with those changes, but I am not 100% sure and therefore need your help to find out and solve this problem.
To open a new support ticket, first select the relevant forum and then click the "New Post" button. Example: You need support for the core plugin? Click on Core Plugin support and click on the "New Post" Button.