"The Miner's Adventures"

Good day.

I can't understand what the problem is.
The "herocopalka" (map editor) crashes the Heroes game itself, i.e., Heroes throws an error while the herocopalka is running.
Before, the herocopalka worked, albeit intermittently; sometimes I had to help it manually (which was tedious), but nevertheless, after 1-2 hours, the desired hero would be found, but now it's a complete standstill... Either the patch is to blame, or it's because I have a different computer, or who knows.
Sincerely, K0Lb@zzeR.