I get that error sometimes when I input the address in the name field; and name in the address field. Sounds rudimentary - but did you make sure you got the right data in the right field? Also, I never select the device type and let it auto-detect.
Any diag output from the event viewer on level three when you try to add it you could include? I know I can't decipher it but others on here typically can; worse case - support ticket.