I did some digging and found that this error is most often a lens communication error. Are you, by chance using a non-Canon lens?
Try the following:
1. Remove the lens and take a picture without any lens on. If you get an ERR 99, then it is a camera issue and you will need to contact Canon for further troubleshooting or repair (ie. not the lens).
2. If you do not get the error with the lens off, try it with a Canon lens or any other lens. If no error, it is a problem with the original lens.
3. If the error occurs on both lenses, clean the lens contacts both on the lens and the camera (refer to your manual).
Hope this helps.
-Tor
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