Digital Editions book not opening

I purchased a digital editions book and opened it on one of my computers, but I'd like to read it on another one. I authorized the first computer without a username.  I erased my authorization from the first computer and deleted the book from my library so I could try to open it on the second computer, but now I can't open it on either one.  I get an error message that says, "Unable to download. Error getting License. License Server Communication Problem: E_LIC_ALREADY_FULFILLED_BY_ANOTHER_USER."  How do I get the book back?  Unfortunately, in trying to transfer from one computer to another, I removed it from my library, so now I can't read it on either computer.