So recently I've been creating maps for the first time. But, unfortunately I keep getting this one error: "Script Stack Overflow (too many embedded function calls)"

What does that even mean?

I've tried adjusting the pathnodes, removing the lights, removing half of the zombie spawns, removing the light grid volume, doors, and much more. I've even tried removing 1 of 2 paths they can take.

Can someone please help?

Thank You