HaloMods "Classic" Read-only Archive

So, whenever I rebuild a single player or multiplayer map, (using HMT 3.5) when I load the level it causes an exception error. Even if I just extract the meta and rebuild without adding anytrhing it still retardifies itself.

What am I doing wrong?
Can you help?
Know any good tutorials?

EDIT: Should I post this in Halo PC modding discussion?
Could someone delete it if it's in the wrong place?

Did you click yes for "Extract BSP"?. Did you follow the tut step by step? Look in the tutorial section, and theres a nice picture and text tut for all to use. It goes in depth and doesnt rush onward like those other bland lazy tuts ppl post to get credit from the community.

Thanks, I'll check that out.