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lua error	[string "module/battle.lua"]:51: attempt to call global 'xxx' (a nil value)
stack traceback:
	[string "main.lua"]:22: in function 'xxx'
	[string "module/battle.lua"]:51: in function 'doSth'
	[string "module/battle.lua"]:55: in function <[string "module/battle.lua"]:54>
	(tail call): ?
	[C]: in function 'xpcall'
	[string "main.lua"]:34: in function <[string "main.lua"]:26>