Hi, With Guix at b7078d5d49d72cb5e5356d698b99540612b4d6c4, I tried to reproduce the issue, but I didn't get any error.
I started FreeCAD with: --8<---------------cut here---------------start------------->8--- guix shell freecad openscad -- FreeCAD --8<---------------cut here---------------end--------------->8--- Then I selected "OpenSCAD" in the box, then the "OpenSCAD -> Add OpenSCAD Element" menu item, then I typed "cube();", clicked "Add", and it created a cube without any error message (I tried with the "mesh" box ticked and unticked). Can you still reproduce the issue on your side?
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