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Err 99 could mean several different things, such as... Memory Card, Lens or Lens contacts.... Here's what you can try: Remove the memory card an enable "shooting with out memory card" and see if you still get the error. If it works your memory card is bad.Try another lens if you can. Clean the lens contacts with a pencil eraser (be careful not to get eraser dust in the camera body or in the lens). Worst case scenario is, Err 99 could be related to the shutter failing which would mean a trip to Canon. Have a good one!
Error 99 and believe me I've been there is Canon's catch all error code cause if the camera can't figure out what's wrong it goes to Error 99. Canon doesn't release any information directly towards error 99 due to several different causes. That was the bad news. The good news or at least the better news is that most of the time error 99 is caused by dirty contacts between the camera and lens. At least this is the problem I'll address in this solution. You will need a new pencil with a red rubber eraser, make sure the camera is turned off, remove the lens from your camera and put a body cap on. If you do not have a body cap lay the camera lens mount face down on a clean lint free surface. Take the lens and hold as vertical as possible with the rear lens element facing down and turn the lens body so you can see the gold contacts. Use the red rubber eraser to gently clean the contacts. Make sure they are clean and all rubber dust is removed from the lens and contacts. on the lens you may use a little puffer/blower or a lens cloth not a tissue. Do not use a liquid cleaner. Once you have finished the cleaning of these contacts either put a rear lens cap on or set the lens where it is not going to get knocked over sitting on a clean dust free surface with the contacts down. Now take the camera and as much as possible keep the lens cavity pointing down to eliminate any rubber dust from entering the camera, clean the contacts again gently with the rubber eraser clear the dust with a lens cloth not a tissue DO NOT use a puffer/blower at this point because it will only blow the dirt into the camera. Once you are satisfied that area is clean reinstall the lens make sure it's locked and turn on the camera. You should be "Good to go". Well lets hope so anyway. Error 99 can also be a problem with third party lenses like Tamron, Sigma, Tokina not having the up to date electronics to match your camera properly Error 99 can also be caused by requiring a camera firmware update but for now lets just go with cleaning the lens to camera contacts.
'Error 99' indicates some problem with
the AF contacts. This is a common error in Canon lenses. It could
indicate a very simple problem like dirty contacts or a much serious
one like the breakage of USM cable. As a first step, you can try
cleaning the lens and body contacts (the metal contacts between the
lens and body) using a pencil eraser. Be careful to hold the body
facing down so that no dust falls inside. After cleaning both the
lens and the body contacts, re-attach the lens and try shooting. If
the AF does not work still, you need to take the lens to an
authorized service center.
is a NONSPECIFIC error message. It may be a lens problem. It
may be a shutter problem. It may be a battery problem. It's Canon's way
of saying "Something happened, and we don't know exactly what, but we
know it isn't right".
You're going to have to try to narrow it down by
using fresh batteries, trying different lenses, trying different
shooting modes, shooting wide open in Av, manually focussing, turning
off IS if you have it. In short, if it happens regularly, try to
identify what you're doing when it happens and how that differs from
when it doesn't.
But don't expect somebody else's solution to work for
you. Their camera may have a different problem.
Make sure your firmware is up to date. The current version is 1.09 which did address a problem with live view that could cause error 99.
Here's the link
Also try removing your lens and putting it back on. Sometimes it is a bad connections between the body and lens that can cause this error.
Error 99 is a NONSPECIFIC error message. It is almost always associated with the LENS. I first got this error on my EOS 20D whei I tried to use an older Sigma zoom lens (7 years older than the camera). I don't use off-brand lenses with my Canons. Try removing the main battery first followed by the time & date battery which is hidden in the battery compartment beside the main battery. This will reset your camera. Good Luck!
This was taken from another site:
My camera displays “bC” or “Err 99” when I try to take a picture. What does this mean? BC is an error condition in EOS film cameras, and means one of two things. It either means “battery check,” so try putting in a fresh battery, or it’s a general error condition of some type. If the battery is fine, have a look at the previous section for things to check, especially dirty lens contacts or lens compatibility problems with Sigma lenses. Error 99 is essentially the same error condition as BC, only on EOS digital cameras. The EOS D30 also had error codes 09 and 10, which are similar.