Sorry it's not an error message it just doesn't work at all.
I've selected the whole model then >Modify>Convert>Polygon to Subdiv. I was roughly following the free human form tutorials by Kurt Boutilier.
I'll include a pic in case it's a problem with the model
You probably exceed the maximum faces just go to the modify convert menu then go to poly to subd select the optionbox(little square on the right) there you should probably amp the number of faces.
See the image for more info
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