Wikitude

Black model in wikitude - No materials no light, just black shape

Hello i explained my problem in title... i made this in maya

(attachment 1)

and then exported it in fbx

(attachment 2)

finally i take it in wikitude 3D encoder aaand.... i get this!

Why? :(

 

Ok i fixed it but i have another problem now: why the encoder doesn't smooth the entire object? He smooths just the building, but the surface is not smooth..

Guys? Could someone explain me why my object becomes totally black if i insert more than ONE material in the scene? Thank you!