the script is error
help me to fix script
attempt to call glotbal 'totable' (a nil value)
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function load(id) 	usgn = player(id,"usgn") 		if (usgn > 0) then 			local usgn = player(id, "usgn") 			files = io.open("sys/lua/scelldata/"..usgn..".txt","r") 			if(files~=nil) then 				msg2(id,"©000255000Your save file found!@C") 				msg2(id,"©160160255Your U.S.G.N ID: "..usgn.."@C") 				parse('hudtxt2 '..id..' 7 "©000255000Login as: '..usgn..'" 40 415') 				for line in io.lines("sys/lua/scelldata/"..usgn..".txt","r") do 				local parses = totable(line) 				if (tonumber(parses[1])>0) then 				yourmon[id] = tonumber(parses[1]) 				license[id] = tonumber(parses[2]) 			break 			end 		end 		else 			msg2(id,"©255000000Failed to load save!@C") 			msg2(id,"©255000000Please check your U.S.G.N account settings!@C") 			parse('hudtxt2 '..id..' 7 "©255000000Failed to Load Save" 40 415') 		end 	end end addhook("leave","save") function save(id) 	if (player(id, "usgn") > 0) then 		save_data = license[id].." "..yourmon[id] 		file = assert(io.open("sys/lua/scelldata/"..usgn..".txt","w")) 		file:write(save_data) 		file:close() 		msg2(id,'©000255001Save Data Successfull!@C') 		else 			msg2(id,"©255000000Failed to Save!@C") 	end end