I have been trying more things out in order to fix the error.
And I found out the game compiles and runs even with the error.
Also I changed the “Interior Sample Spacing” and “Interior Border Sample Spacing” around somewhat.
And this had an effect on whether the error was there or not.
So I guess this whole time the error had nothing to do with “overlapping spline points”.
I think if the “Interior Sample Spacing” and “Interior Border Sample Spacing” align exactly (which happens at certain sizes) it gives an error.
Why is this an error?
And why does the error refer to the spline points overlapping?
Any links which might be helpful regarding this issue is welcome.