Normal() takes 4 arguments (1 given)

[matiasmorant]

I have never used this addon. When I try to export, it says

line 799, in __init__
    self.normal = M.geometry.normal(v.co for v in self.vertices)
TypeError: normal() takes exactly 4 arguments (1 given) 

I have checked that the generator used as an argument, generates 3 Vector

I haven't marked seams or anything. I admit I don't know how to use it, but assumptions should be checked and error messages with usage hints should be printed

[matiasmorant]

I tried it again and it magically worked... I don't know why, because I didn't change anything

[addam]

This error happens if you use blender 2.73 or earlier.

[matiasmorant]

Thanks. Impressive software