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You need a reoriented kernel if you're using an i9000 rom, go to the xda dev forums and look in the captivate>dev section for xcal's or setiron's kernel.
But if i were you i'd flash the newer jpx rom that just came out, samsung updated the rfs drivers in it, it so fast it doesn't even need a lagfix [ROM]*Official*Darky Port using Xcaliburinhand's i9000 Reoriented - xda-developers
Well 6.03 out now.