HaloMods "Classic" Read-only Archive

Hi, I'm new to modding and new to this forum. I recently made a modified verson of Bloodgulch.map to play on for my PC. I replaced it with the traditional BloodGulch. I started up halo and it was working fine. I started the game setup and chose Bloodgulch. After the game loaded, my halo shuts off, and a message box comes out that says "exeption". This has happened for many of my different Mods recently. It didnt used to do that? What am I doing wrong? Thank you.

Dont listen to cuda yes that will stop the message, however your game will still crash because you only get an exception when somthing in the map goes wrong that the engine can't handel.