ERR99 is a default error code in the Rebel.
There are a number of things you can try...
Remove your battery and the memory card and let it sit for a little bit to reset. Put them back in and check it then.
Also try cleaning your lens contact points,(the gold metal contacts on the lens and the camera body) with a clean pencil eraser.
If you can, try testing another lens with your camera, that often works, which may mean it is a contact point or lens compatibility error.
I think thats the code for the shutter, its no good i can check on monday and post again cant remember right now there are alot of codes that we have
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just bought a XTi attempted format CF card get err 99. Camera says that the CF card is bad. tried a second card smae results
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