Compute button is always gray

Hi,

I just downloaded the trial version but I can’t get it to wrap.
Is this because my node are badly connected? or is this because this is the trial version?

http://img15.hostingpics.net/pics/796693wrapgray.png

Thanks.

ps, I tried with and without the green connection betwen ‘points’ and ‘wrap’

Please press the middle mouse button over the red node. At the bottom of a pop-up dialog you will see an error message. What does it say?

Oh my bad, there was non manifold edges.

I did not correctly cleaned it before importing it.