That can be caused by a lot of things, it would help us help u if u provide more information, such as your network settings, printer used, computers and OS
Is the printer connected to a computer and shared to others via network, or is it a network printer, connected directly to the network? If it's connected to a computer, can it print from that computer? Have u checked the "file and printer sharing" in network setting? Have u shared the printer from the master computer? Have u tried reinstalling the printer driver?