[Problem]Cube quest

Hi.
I added new crafting system(cube) on client.
But it's doesn't work when I use this quest:

HTML Code:

quest cube begin
state start begin

function cube_open(vnum)
cube_results = {}
cube_needs = {}

cube_results[20083] = "460,1"
cube_needs[20083] = "145,1&72701,1&72701,1"

cmdchat("cube_npc_id "..vnum.."")
cmdchat("cs_result "..cube_results[vnum].."")
cmdchat("cs_need "..cube_needs[vnum].."")
command("cube open")
return
end

when 20083.click begin
cube.cube_open(20083)
end
when 20017.click begin
cube.cube_open(20017)
end 
when 20022.click begin
cube.cube_open(20022)
end
end
end

In syserr server I have:

HTML Code:

SYSERR: Jan 10 13:22:21 :: RunState: LUA_ERROR: locale/germany/quest/object/state/cube:10: attempt to concatenate field `?' (a table value)
SYSERR: Jan 10 13:22:21 :: WriteRunningStateToSyserr: LUA_ERROR: quest cube.start click
SYSERR: Jan 10 13:45:31 :: RunState: LUA_ERROR: locale/germany/quest/object/state/cube:6: attempt to concatenate field `?' (a nil value)
SYSERR: Jan 10 13:45:31 :: WriteRunningStateToSyserr: LUA_ERROR: quest cube.start click
SYSERR: Jan 10 13:45:32 :: RunState: LUA_ERROR: locale/germany/quest/object/state/cube:6: attempt to concatenate field `?' (a nil value)
SYSERR: Jan 10 13:45:32 :: WriteRunningStateToSyserr: LUA_ERROR: quest cube.start click
SYSERR: Jan 10 13:45:36 :: RunState: LUA_ERROR: locale/germany/quest/object/state/cube:6: attempt to concatenate field `?' (a nil value)
SYSERR: Jan 10 13:45:36 :: WriteRunningStateToSyserr: LUA_ERROR: quest cube.start click
SYSERR: Jan 10 13:45:42 :: RunState: LUA_ERROR: locale/germany/quest/object/state/cube:6: attempt to concatenate field `?' (a nil value)
SYSERR: Jan 10 13:45:42 :: WriteRunningStateToSyserr: LUA_ERROR: quest cube.start click
SYSERR: Jan 10 13:45:47 :: RunState: LUA_ERROR: locale/germany/quest/object/state/cube:6: attempt to concatenate field `?' (a nil value)
SYSERR: Jan 10 13:45:47 :: WriteRunningStateToSyserr: LUA_ERROR: quest cube.start click