HaloMods "Classic" Read-only Archive

Alright. After exporting a model via HMT, editing it in 3ds Max, and re-exporting it as a .obj (and then converting it to OBJ7), I can't import the new model into HMT. When I try, I get this error:

"Couldn't read vertex and index data"

What do I need to do to fix this?

If you did any kind of verticie/edge/face deletion the it wont work. You can only move the vertices, faces and edges, not delete.

I only did scaling of the model... Also, I tried importing it into and exporting it from 3ds without changing the model, and I got the same error.