Canon digital camera 350D

check for bent CF pins

Err 99 could mean several different things, such as... Memory Card
Lens
Lens contacts....

A few things 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 may be 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)
I have heard Canon recommend upgrading the camera's firmware (go to Canon's website todownloadthe latest firmware and follow Canon's instructions for the upgrade).
I saved the worst for last, Err 99 could be related to the shutter failing which would mean a trip to Canon for repair.
Good Luck

There are many articles on the Internet talking about Canon's Error 99, some are more rational than others. Of all the articles I've looked at, the one that seems the most comprehensive, well-researched and easy to understand is here (follow link). I hope it works out for you.

It is due to some kind of electrical contact failure.
For more details and common causes of Err 99 read the following article:
http://www.lensrentals.com/news/2008.12.31/canon-err99

Have you been to the support section of Canon's website to find out what "error 99" means?

I think I answered this earlier did you ask this question more tan once?

well here you are a simple fix from experience.

The guy at Canon tech support listened to my woes and then told me that the lens contacts were dirty and to get a pencil with an eraser on the end, just a regular old pencil with a red rubber eraser. Detach the lens from the camera, hold it so that the lens’ gold contacts are pointing down and lightly erase their exposed surface, cleaning them of any hand oil that might have gotten on them. Do the same thing with the gold contacts inside the camera body. This is a bit harder but it’s doable: just hold camera so lens opening points down so no gunk falls in. Erase lightly. I used a lens cloth and dabbed at the contacts rather than blow them so as not to blow the erasings inside the camera.
I did this to each of my three lenses just to be sure. Lo and behold, it worked (so far anyway). I’ve shot numerous pictures with each lens and have not gotten a single error 99 message.

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change the lens or try cleaning the connector tabs with a eraser.

Error code 99 means the lens is not communicating properly .

You need to remove the lens and clean it . Place it properly . If it is not placed properly you will receive this error .

more than likely a shutter operation problem

Your issue is most likey a lens error goto wolf camera and have them try 1 of their lenses on your camera.