Arm breaks at elbow backwards with IK

Can someone tell me what I did wrong? When I move the handIK.L the arm breaks at the elbow backwards. I tried changing the rolls, but I it didn’t work (and I don’t know what to change them to.)

Blend file: http://www.pasteall.org/blend/42461

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You have to have an angle in edit mode for the IK solver to figure out where to go. Currently you have the arm straight. I have edited it to show you how to fix it.

http://www.pasteall.org/blend/42463

Thanks for responding. I had heard about angling the limbs when modeling. I didn’t know I needed to do that with the bones in edit mode. Hopefully, I’ll be able to copy what you did. It looks like I will be able to.