What versions are you running? (Beta?/2.52?, beta/1.134?) Also what version of Civ5? (newest patch?) GK/DLC? I do see an issue loading the retreat before melee promo, which should be in GK even if you don't have the Inca DLC.
The lua doesn't have anything in it, suggesting it isn't loading the mod in the first place. When is that log from? An attempt to load a save? Or an attempt to run the mod with a fresh game?
Where are you trying to load? From the in-game menu (which won't even offer loading as an option because it breaks the mod), from the main menu? or after loading the mod?