Cannot import because drive/folder already being watched by another device

I have an external harddrive with all my photo’s that that I want to manage with Mylio (organize, face recognition etc). The first time I have imported the top folder (d:\fotos) but because there are a lot of redundant folders I decided to start all over and only import the folder one level below that I really want to import. So I have tried to do a factory reset, reinstall mylio, delete everyting from mylio on my computer and external hard drive. But still I am not able to reimport photos in Mylio because Mylio still complains about the top folder is being watched. What can I do?

In Mylio, check under Settings -> Source Folders and look for the offending folder. you should be able to switch that folder off.