ERROR: Geometry does not have second UV channel on node ...

ERROR: Geometry does not have second UV channel on node ...

Hi. When I want to import my scene to the engine, I get this error message:


I have checked many times, and that geometry has 2 uv channels correctly. The strange is, if I try to import the scene with that geometry only, I don't get that error message and the scene is imported succesfuly and I can even do the light baking. It happens with any geometry when I have more than one geometry with 2 UV channels in my scene. What can be the cause of this error?

UPDATE: this happens when I some objects in the scene like the skydome, floor or an imported object from the library. However, the error message sometimes says the error is in another model, not in the clonflictive one.