CS2D 
Save error
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This is the code
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addhook("die","save_die")
function save_die(id)
if (player(id,"usgn")>0) then
io.output(io.open("sys/lua/RWsaves/"..player(id,"usgn")..".txt","w+"))
io.write(exp[id].." "..level[id].." "..HPP[id].." "..APP[id].." "..SPP[id].." "..Point[id].." "..hasbomber[id].." "..hassuper[id].." "..hascyborg[id].." "..hastrooper[id].." "..KHPP[id].." "..KAPP[id].." "..KSPP[id].." "..KR[id].." "..KD[id])
io.close()
end
end
LUA ERROR :sys/lua/TotalWar.lua:805: attempt to concatenate field '?' (a nil value)
line 805 was the io.write
im aleready put array and other thingies but still cant fix this.
Help!