Importing problem

[Warlord]

Hello everybody. I created a scene in Sketch-up and imported it into I-simpa. I-simpa couldnt make a simulation because of geometry error!. I recreate the model from a cube, only by forming it, not adding any new sufrace to not cause any geometry error, but result is the same, no simulation, geometry error. Just dor testing, i just created a basic cylinder shape, imported into I-simpa, but even a basic shape I-simpa is given error, couldnt make any simulation. Tried to create shapes in Freecad and imported into I-simpa, results are even worse then sketch-up, found more errors. Where i mistaken in importing here or what i made wrong could anyone help me?