Err 01 on Canon T2i + Sigma 28mm 1.8

Started Dec 30, 2013 | Questions thread
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Err 01 on Canon T2i + Sigma 28mm 1.8
Dec 30, 2013

So I picked up a used lens off of eBay that wasn't as tight as my 50mm. I ended up with a Sigma 28mm 1.8 but it keeps giving me Error 01. I cleaned the contacts with a cotton swab and rubbing alcohol but it still does not work. The lens works fine and will take pictures + autofocus. The pictures save, but the error pops right up and don't let me do anything. However, the pictures save in movie mode and it doesn't give me the error—but I'd rather use the eyepiece.

I've read online that some people have had to ship it to Sigma for a new chip or firmware, but I'm having a hard time figuring out if this is the problem.
Any suggestions?

Pictures of the lens:

 yuzi92's gear list:yuzi92's gear list
Canon EOS 550D Canon EF 50mm f/1.8 II Sigma 28mm F1.8 EX DG Aspherical Macro
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Canon EOS 550D (EOS Rebel T2i / EOS Kiss X4) Sigma 28mm F1.8 EX DG Aspherical Macro
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