Lighting glitch in hobby version of Twilight render for Sketchup

Recently I had problem that my roof material when rendered looks like some sort off reflecting metal.
Any help or suggestions from you guys what to do next would be higly appreciated.

This is how my house looks in Sketchup.

Check the face orientation in SketchUp. Is the face on the roof reversed?

Thank you Dave, problem has been solved. I checked the roof face orientation and it was inversed wrong sides. :smile: