HaloMods "Classic" Read-only Archive

First of all, I should be able to load up Halo 1 with entity right?

Second, how come it always tells me I have an error when trying to load a Halo 1 map?

I have the newest version, 1.2.1

All the MP maps from Halo 1 are in the same folder with the ui.map

im not too sure that entity works w/ halo 1. but you could try using the latest version of entity beta because i think 1.2.1 is alpha.