[Tenryu]

Hmm. It doesn't look like a bug, more like you have a virus eating data.

The Default_AI_DesinCreation.txt file, in the AI folder, is referencing a block of text in the DefaultStrategies.txt file(this is in the Data folder).

I'd go see if you even have a DefaultStrategies.txt file there and a section that starts as "Fighters". If you don't, copy one from another Mod folder.

But, like I said, it doesn't sound like a bug. If it was, noone would be able to play. You may want to run a virus scanner on your system, on the other hand, it might just be data-rot, a mysterious inexplicable form of computer altzhiemers. Run scan disk to see if you have a sector going bad on your HD.

If no virus or rot, you might have erased or screwed it by mistake somehow, you could always reinstall the game to a different directory and go copy the DefaultStrategies.txt file from there to your current game. That might fix you.

Hope this helps.