Error when loading my own map

[Spinonitaliani]

I've been working on a map for a little while now. It's been working fine and its turning out good except for some reason one day i wasnt able to load it. I open the map and it loads everything (units, doodads, etc) and then right when the loading should finish, it comes up with an error message.

It is one where you choose to send an error report and i havent sent one. It automatically terminates world editor. I'll try to attach a pic if i can get it to work.
If it helps, the map includes a lot of downloaded models for units from this site.
Thanks everyone.