QUESTION need help w/ ai splines and surface boundaries

Yooo

I recently started working on couple tracks and everything goes well until I try to record AI splines.
Most of the tracks contains highways/freeways (2-5lane). I've recorded splines before(using AI Spline Recorder by x4fab) for multiple tracks, but when it comes to my tracks, it ends up crashing.

I've been told that it has something to do with Surface Boundaries. I have also tried AI Line Helper, but the results don't change. Hoping someone can help please.