Pet system SG (Rev.34083) PROBLEM!

[[Gherusio]]

Hi guys,
I would have a problem, almost as soon as I click sull'items 53001 (the call of the pet) does not happen nothing, obviously with the quest runnata.

Here's what I get in SYSERR:

PHP Code:

SYSERR: Jul 26 11:36:30 :: RunState: LUA_ERROR: [string "pet_system"]:6: attempt to call field `is_summon' (a nil value)
SYSERR: Jul 26 11:36:30 :: WriteRunningStateToSyserr: LUA_ERROR: quest pet_system.start letter 


Here is the quest:

PHP Code:

quest pet_system begin
    state start begin
        function get_pet_info(itemVnum)
            pet_info_map = {
            --  [ITEM VNUM] MOB_VNUM, DEFAULT NAME, buff_idx, spawn_effect_idx
                [53001]     = { 34001, " - Fenice Rossa", 0},
                [53002]     = { 34002, " - Renna", 0},
                [53003]     = { 34003, " - Fenice Blu", 0},
                [53004]     = { 34005, " - Baby Azrael", 0},
                [53005]     = { 34006, " - Baby Azrael", 1},
                [53010]     = { 34008, " - Leonida", 0},
                [53011]     = { 34007, " - Khan", 0}, --Tigre
                [53012]     = { 34005, " - Porky", 0}, --Chingiale
                [53013]     = { 34006, " - Rufus", 0}, --Cane
                [53007]     = { 34010, " - Bambi", 0},
            }

            itemVnum = tonumber(itemVnum)

            return pet_info_map[itemVnum]
        end
        function get_spawn_effect_file(idx)
            effect_table = {
                [0] = nil,
                [1] = "d:\\\\ymir work\\\\effect\\\\etc\\\\appear_die\\\\npc2_appear.mse",
            }
            return effect_table [idx]
        end
        when 53007.use or 53013.use or 53012.use or 53011.use or 53010.use or 53005.use or 53004.use or 53003.use or 53002.use or 53001.use begin
            local pet_info = pet_system.get_pet_info(item.vnum)

            if null != pet_info then

                local mobVnum = pet_info[1]
                local petName = pet_info[2]
                local spawn_effect_file_name = pet_system.get_spawn_effect_file(pet_info[3])

                if true == pet.is_summon(mobVnum) then
                    if spawn_effect_file_name != nil then
                        pet.spawn_effect (mobVnum, spawn_effect_file_name)
                    end
                    pet.unsummon(mobVnum)
                else
                    if pet.count_summoned() < 1 then
                        pet.summon(mobVnum, petName, false)
                    else
                        syschat("You already summoned a pet.")
                    end
                    if spawn_effect_file_name != nil then
                        pet.spawn_effect(mobVnum, spawn_effect_file_name)
                    end
                end -- if pet.is_summon
            end  -- if null != pet_info
        end -- when
    end -- state
end -- quest 


Help me please

help me please is urgent: (

pleaseeeeeeeeee