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I had the same with my now ex 24-105L, Error 01 and could only use the 24mm end. It was the dreaded diaphragm problem and needed replacement. Sods law you got it after buying it, and probably not the sellers fault. It is a fairly expensive fix but not as expensive as a new lens. I had mine fixed and the lens was returned as new. Canon also cleaned all the inner optics and tightened the barrel which had a minor creep to it. It's worth doing.
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