Surface from Points trouble

[Joseph_Oster]

R7 .3dm file cannot be opened in R6.

And this is a DUPLICATE POST where R7 is mentioned there, but not in this thread:

Creating Terrain from Contours

Hey Guys, I’m an architecture student tasked with working in Rhino7, specifically in Grasshopper. I’m new to Grasshopper, but experienced in Rhino6. I want to generate a site model from a set of contour lines I have. I followed a tutorial on YouTube (How to transform Contours into a Rhino Surface - YouTube), but it simply doesn’t work. I always get the same error in the end, when trying to generate a surface from points: “a point in the grid is null. fitting operations aborted”. [Capture d’é…