Exception when updating a Windows Communication Foundation service reference
While working with WCF and updating a service reference you may see the very informative error: Exception from HRESULT: 0x80041001
Now I don't know every possible cause but in my case it occurred because I had the generated service file open and it was marked as modified. Closing the file was all that was needed to fix the problem once I realized what was causing it.
Good luck with WCF!