Huh?

The camera is telling you there's not enough light in a dark room to shoot at f22 except with an extremely long exposure. Are you testing the camera to see if it works? Better to take pictures in a variety of normal situations, using the meter on manual and automatic exposure, and see if they turn out. You could test the meter against an external meter or another camera if you have doubts.

I am sorry I can't answer your question any better. I don't think I know what you are trying to accomplish. Why are you shooting a black canvas in a dark room? Why at f22? Even at ISO 800 or 1600 you'd need f2 to get a reasonable shutter speed in a dimly lit interior.

-Laura