Bannerlord version is outdated.
I reinstalled the main game, I reinstalled online mod. I tried the change in the xml files and I tried verifying game files in steam...
Anyone can help me? ((
Update your game to latest version, make sure you are not opted into any betas, (Go to Library, right click Bannerlord, Properties, Betas and select none)
Well, the fastest way to get help for this issue is to take a look at the Bannerlord Online discord. Our team of Helpers and Moderators will gladly help you with your issue on there.