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In page Canon EOS 350D:

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When using third party lenses, most notably older Sigma lenses, there may be a compatibility issue. Reports exist of people receiving "Err99" errors when using such lenses. The problem is more pronounced when using older lens that do not feature an HSM focus drive. Using the problematic lens with its largest aperture is sometimes possible.[2] Another cause of Err99 messages involve EF-S 18–55 lenses (kit lens for the 350D and 20D) that are defective; purchasing used EF-S 18–55 lenses is a risk factor, especially from eBay auctions. Some auction listings state that the lens was never used – especially those claiming that the lens was originally part of an EOS 400D kit; the best way is to verify the serial numbers indicating the manufacture date.