Game crashes on startup with no other mods installed.
Forge stable (2768)
ancientwarfare-1.12.2-2.7.0.668.jar
CodeChicken Lib 1.12.2-3.2.2.353-universal

Most Relevant line:
Caused by: java.lang.NoSuchMethodError: net.minecraftforge.fml.relauncher.ReflectionHelper.findField(Ljava/lang/Class;Ljava/lang/String;Ljava/lang/String;)Ljava/lang/reflect/Field;

Full log:
https://pastebin.com/yc6tLjd1

I believe you're going to need Forge 2815.

Yes @ArkenorOakshadow is correct, you will need to update your forge. I have a fix in dev that will actually start requiring the forge version AW was built with to prevent these crashes in the future, just need to finish some stuff and release it.

Thanks for the info! I assumed that was the case, but since the mod didn't have the req. specified I wasn't sure if it was intentional