Error Getting License. License Server Communication Problem

I get the following error message when I download my e-book from Kobo to my ADE. "Error getting Licence communication problem E_IO_CANNOT_OPEN". I am on Windows 7 and haven't had any trouble in the past. I have had Kobo delete and re-add the book and reset my Kobo license. I have uninstalled and re-installed the latest edition of ADE, and de-authorised and re-authorised my computer on ADE. None have helped.