Axstina

I was using an outdated version i get it now

Hello! I am looking for some help with an issue I am having with the slicing process of my model in Cura. It appears when I slice my model it does not generate the top of the model and assumes it is hollow. I also have this problem with nearly every model I create. I am using blender to make this model and nothing advanced took place. I also checked the manifold and it said it was fine. I also added supports, however it adds them to a non-existent roof. (Cura V4.8.0) please help!!!! thanks. Base Proto Redo.stl