Hi, now everything works fine but your plugin doesen't want to export a specific layer. I even tried to merge the content of that layer on another layer...no way! It export the content of the layer but not that specific geometry. They are simple polygon..
If you can have a look I have exported the scene with the objects (no textures). The layer that is not exported is the n°5 named doghe (it is also the first) If you want try to copy it on another layer I didn't get any result