Check for clean lens to body gold contacts.
Take the lens off the camera. Look at the gold contacts that are in the body and on the lens. Many times, it's a simple process of rubbing a pencil eraser on these to remove dirt/film on them to allow proper contact. BE CAREFUL not to allow eraser crumbs to fall in the camera body. You can tip the opening slightly downward while you're cleaning... a lens brush can help remove any crumbs too
Let me know if it clears up your error.
K
It is a very common problem with the 40D. Send it back to the factory for the fix.
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