wed error

I am using autodesk 3d to make my models. Well I imported my model into wed and when i try to compile it starts then stops a fourth of the way and gives this error:
Block 1- Plane too narrow



any ideas , when i delete my model the stage compiles so i know its the model >_<.


I can import the model into Med then save it and load it into Wed and it works fine, but that causes me to lose the skin i attached to it in Autodesk 3d. And Autodesk has some features/materials that I think are beyond Med's creation ><.

so does wed not allow for material/skins from Autodesk 3d? if not, this sucks......