Pues según acabo de leer a un colega americano, este error es debido a los contactos con el objetivo te dejo la solución que da. Salu2.
Desmontar la lente
Quitar la batería y la tarjeta CF PERO NO LIMPIAR LOS CONTACTOS
Esperar unos minutos
Montar la lente, batería y CF
En teoría, según el colega "yankito" como nueva.
Hi,
I had the same problems with my new 40D a couple times. It was really annoying for me and I thought to return back my camera back. Before that I made some research in dpreview and other sites and found that this error usually (not always!) related with contacts between lens and camera. I found some kind of a solution here:
http://www.dealtime.com/xPR-Canon-EOS-40D-28-135mm~RD-402246569604
I unmount the lens, remove the battery and cf card, but didn't clean the contacts. Wait for some minutes. Then mount the lens and put the battery and cf card back. And I am not getting any errors since then. I am not sure if I will get the error againg or not but it is working for now. I hope this will help.



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