Questions about the Heroes 4 map editor.

Hello, I have a question that isn't exactly about mapmaking. I downloaded the Equilibris mod and the maps. I made some changes to a map, specifically giving the starting heroes different artifacts. As a result, when I launch the game, I get an error message saying "file corrupted." Online, people are saying that there's a conflict between the game and certain artifacts on the map. Maybe there's a patch that fixes this. Interestingly, I remember doing the same thing before, and I didn't have this problem. But now, after reinstalling the game, I'm getting this error.