I'm sorry to say that a bug has been found by several players whereby they have no income if they're playing a custom game with the Yelang faction and that faction enters the Warring States era.

I've just uploaded an update that fixes this issue for new games.

However, it won't fix games that are in progress. If you want to keep a game you're already playing you can fix it by editing the save game file. You'll need to open it in a program that can read large files.

Then search for "ESB" (including the quotes) and replace it with "Early Southern Barbarian"
Below it will be a line that has "SB". Replace this with "Southern Barbarian"

I suggest taking a copy of your game before doing this, just in case you or your editing program mess up.

Apologies for the inconvenience and frustration.