Unknown model error

[eXciTe]

This is pissing me off , when i make a model and i imported into W. Editor i set the paths,restart W.E and when i assign the model to a unit World Editor crashes.What this mean? what is wrong with the modell?
Any help...

 

[Mecheon]

Bugged model

It means it won't work for some reason

 

[eXciTe]

So i cant fix it ? its just bugged and i delete it?