Black spots on su podium

Hello, I am new to Podium and sketchup and I have been trying to render with SU podium, however, the render comes out with a lot of black spots, Do you have any idea how to fix this?

could be a flaky OpenGL support of the used graphcis card driver which is pretty common for the low-end intel HD series.

Update your graphics card driver first, switch to a decent, dedicated graphics card (= GeForce GTX/RTX) second.