Model question concern

I'm getting an error when I try to load the HeavyRebel Model. I attempted to replace the dwarf Model with the heavy rebel, and this is my error. I assume this is an exportation issue?

Error 1 Error normalizing vertex bone weights. BoneWeightCollection does not contain any weighting values. C:\Documents and Settings\fyaconiello\Desktop\DwarfTutorial\DwarfTutorial\RebelHeavy.X DwarfTutorial

I tried googling this and came up with : http://forums.xna.com/thread/7812.aspx

tell me what you guys think.