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I think you should check on whether your Roland printer is at the IP address configured by your Roland VersaCAMM printing software.
Also check whether the printer's queue has any print jobs lingering in it, and clear them out.
If the Roland printer is connected directly to the computer, then is the cable directly connecting the two, or is there a network hub or box or other equipment between the two?
If the connection is direct, by network cable, make sure you are using a 'crossover' cable rather than a 'patch' network cable. If the printer was recently moved, or the computer, this is quite a possible mistake.