sanity_check_ruleset_data() error message refers to tech_cost_style by old numeric value
sanity_check_ruleset_data() has an error message: "Cost based free tech method, but tech cost style 1 so all techs cost the same.". That '1' should be "Civ I|II" as in ruleset format.
sanity_check_ruleset_data() has an error message: "Cost based free tech method, but tech cost style 1 so all techs cost the same.". That '1' should be "Civ I|II" as in ruleset format.