I can`t edit my map

I was updating my map during this week and suddenly, I could not access it (editor). The game stops at a certain loading point and does not run, sometimes it just freezes and does not respond. If anyone has come across this, then how to solve it?

try copying the objects.dat, roads.dat, trees.dat, and heightmap into a different map to see if that loads

I remember something similar happening if objects were outside of the map