It sounds like this issue: https://www.coh2.org/topic/59135/mod-builder-saving-to-coh2-alpha-folder/post/591132
Could you check the "Company of Heroes 2 Alpha\mods\tuning" folder?
Thanks for the link
I check the My Games\company of heroes 2\mods\tuning also the steam\common\company of heroes 2\mods\tuning but I can't see your 'Alpha\mods\tuning folder? I search my computer for the Alpha but nothing or I think you mean just my 'company of heroes 2\mods\tuning'
So for testing I made a new mod with mod builder and save it into another documents folder name - 'mod projects' and just clone one unit and saved it and built it, and it saved the new mods name in the my game\company of heroes 2\mods\tuning, also then I went into the game and it was there it show up how strange,
With the new mod I just made I just copied the 'instances' folder from my first mod in to this new one think it would just be easy and save me time at first yes it opens in mod builder but all the files to the units I cloned in the game mod has 'null' next to it, it would have been too much work to put it all back into place so I gave up and delete it.
My first mod kings was saved like this C:\user\name\my games\company of heroes 2\mods\mod projects\kings\kings.xml
art and ui
my games\company of heroes 2\mods\tuning\data\art\ui
But because of the error I just copied and paste it into the c:\user\name\documents\mods. But run into problems because mod builder tell me the Java was missing the exe file (when it was not) so had to reinstall it again, next problem was the missing SDK so had to reinstall that also what a pain and then missing art and ui files so had to copy them over after that it took a bit of the time for mod builder to build it at first I am sitting here thinking it's going to give me another red error but no, (lucky?) now it saved in the new folder but not the mod sga file to show up in game. I don't think it is that easy to just copy & paste your mod to another folder with out the problems.
Because mod builder don't like it.
Just an update today 20:09pm
I might found the problem! after I shut down my computer and boot up again Now mod builder builds my mod how strange is that! also now I don't need to copy and paste my mod sga file over to the my games\company of heroes 2\mods\tuning folder it works again I also checked my game with stream to verify the game files. and it's ok I have just finished cloning the west -germans also germans units and mod builder builds it without the error code now but I tested my mod out in game to be sure that all the units are working in game and it was OK.