My initial tests revealed it might be with this lens, the Canon EF-S 17-85mm f/4-5.6 IS USM, might have been causing the error. Yet, I still have to do more rigid tests, as when I attached back this lens after rubbing off gently its gold contacts, error was gone again.
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My brother is also having the same problem on my old 400d with kit lens..not sure what’s causing it
For me so far, it appears it was with the gold contacts that connect the lens to the camera. I hope that was all.