Near Shading errors

[Abrie]

Good afternoon,

I'm trying to follow the PVsyst tutorial on modelling. I've opened the Geneva project and open the Near Shadings/Construction tab.

It keeps popping up with "Erreur ArcSin" - "Angle2D Argument = -1,937500"

I try to move pass it but whenever I try to rotate the parallelpiped object it looses its shape.

Can somebody please assist. I'm working on 6.37 Premium. I have attached a sample of the image and error.

Thank you,

Abrie