Bought first eBook and authorised Adobe Digital Editions on my computer; click on eBook, and now this message appears: Unable to download Error getting License. License Server Communication Problem: E_ADEPT_REQUEST_EXPIRED

Bought first eBook and authorised Adobe Digital Editions on my computer; click on eBook, and now this message appears: Unable to download Error getting License. License Server Communication Problem: E_ADEPT_REQUEST_EXPIRED

Would like to add that I tried looking at the date/time/place etc. and they already appear to have been synced since the beginning.