The error 99 code has different sources, to identify it do this:
Remove the Lens, and try shooting at various speed high (1/1000 or more) then at more normal ones 1/15, 1/50 etc.
If you see the error 99 then contact canon this is a problem wit the camera.
In this case contact Canon directly.
If you still don' have the error message, then put back the lens and try shooting at different apertures (for a lens the error 99 correspond with an aperture problem)
try every aperture. If the problem appears then, clean the lens contacts both on the camera and on the lens.
If the problem is still there, contact the lens brand, you certainly have a blocked or sticky aperture.
Hope this helps.
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