The Nikon D-90 users manual says on page 256 that the ERR message indicates a camera malfunction and that it can be cleared by releasing the shutter.
I've found on my D-90 that the only way I can get the shutter to release is my turning the camera off. When I turn it back on the ERR message is gone and the camera functions as it should.
Occasionally, I have had to remove and reinstall the battery to make the camera turn off but this happens only rarely.
The users manual says if the condition occurs frequently or persists that you should contact a Nikon authorized repair center. I suggest that you contact Nikon tech support at
www.nikon.com to see what they suggest. I think this information would apply to the D-80 as well.
The r05 is not an error message. It is an indication that the camera is shooting in burst mode (multiple shots with one button push) and that you can shoot five more shots before the camera must pause, clean its cache and be prepared to shoot again.
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