It means that you have started a match where at least one AI player played as a country that could not build anything from [AI]BuildWeapons=. Which country it is is a known unknown.
I can't say where it fails, but it could be the tags Owner=, RequiredHouses=, ForbiddenHouses=, or AIBasePlanningSide=, or the building is disabled because it provides a SW that has been disabled by the game option. _________________ QUICK_EDIT
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