What can I do when I am downloading my first eBook on Adobe Digital Editions and I see the following message? Unable to download Error getting License. License Server Communication Problem: E_ADEPT_REQUEST_EXPIRED

What can I do when I am downloading my first eBook on Adobe Digital Editions and I see the following message?

Unable to download Error getting License. License Server Communication Problem: E_ADEPT_REQUEST_EXPIREDUnable to download

Thanks!