Rotopaint: Missing input channel

Hi
hope this question isn’t too stupid. I’ve been following this tutorial (http://magazine.creativecow.net/arti…-effects-users) about nuke and tried to add a mask to my scanline render (trying to add a mask to my 3d object flying around a corner for 3 days now. here is his setup)

What am I doing wrong?

Thanks in advance

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