Two printers - can't delete one of them

[captgadget]

These are network printers. When I do http://localhost:631/printers it shows two printers. Only one of those is good. When I try to delete the one it gives me this message: firefox can't find the server at hayden.local. I get the same message if I use the system>administration>printing.
How can I get rid of the one that doesn't work?