Just had a look, wasn't sure what those ' some errors ' were but I presume its the following 2 things:
- no units appear under your nation in the editor list:
This is caused because you didnt change in the .NDS file the [COUNTRY] entry
it reads now as
and should evidently be
This entry is the second entry in the line in the NATIONS.LST and as such should be the same to make units/buildings appear in the editor.
and then probably the next problem:
- Barbarian nation not showing up in the nation drop down list in the random map menu:
This is caused because you didnt change the AI/AI.dat in the main Cossacks-BackToWar folder. Pay attention here, there is already an AI.dat file in your patch but I'm talking about the one in the main cossacks directory. Adjust accordingly just like the ai.dat file inside the patch01.gs1 file.
Hope that helps.