Exercise Weapons/Dummy TFS 1.X 8.6

[sirluumi]

We tried adding exercise weapons with this code

local dummies = {11257, 11264, 11245, 9934, 8707}
local skillRate = 1*configManager.getNumber(configKeys.RATE_SKILL)
local isTraining = 37
-- skillRate = 1.1*30 = 30 + 3 (10%) = 33x
 
local function start_train(pid,start_pos,itemid,fpos)
    local player = Player(pid)
        player:setStorageValue(isTraining, 1)
        player:setStorageValue(Storage.isTraining, 1)
    if player ~= nil then
        local pos_n = player:getPosition()
        if start_pos:getDistance(pos_n) == 0 and getTilePzInfo(pos_n) then
            if player:getItemCount(itemid) >= 1 then
                local exercise = player:getItemById(itemid,true)
                if exercise:isItem() then
                    if exercise:hasAttribute(ITEM_ATTRIBUTE_CHARGES) then
                        local charges_n = exercise:getAttribute(ITEM_ATTRIBUTE_CHARGES)
                        if charges_n >= 1 then
                            exercise:setAttribute(ITEM_ATTRIBUTE_CHARGES,(charges_n-1))
                            local voc = player:getVocation()
                            if skills[itemid].id == SKILL_MAGLEVEL then
                                magicTry = voc:getRequiredManaSpent(player:getBaseMagicLevel() + 1)-player:getManaSpent()
                                player:addManaSpent(math.ceil(250))
                            else
                                player:addSkillTries(skills[itemid].id, 1*skillRate)
                            end
                                fpos:sendMagicEffect(CONST_ME_HITAREA)
                            if skills[itemid].range then
                                pos_n:sendDistanceEffect(fpos, skills[itemid].range)
                            end
                            if charges_n == 1 then
                                exercise:remove(1)
                                return true
                            end
                            local training = addEvent(start_train, voc:getAttackSpeed(), pid,start_pos,itemid,fpos)
                            player:setStorageValue(isTraining, 1)
                            player:setStorageValue(Storage.isTraining, 1)
                        else
                            exercise:remove(1)
                            player:sendCancelMessage("Your training weapon vanished.")
                            player:sendTextMessage(MESSAGE_INFO_DESCR, "Your training weapon vanished.")
                            stopEvent(training)
                            player:setStorageValue(isTraining, 0)
                            player:setStorageValue(Storage.isTraining, 0)
                        end
                    end
                end
            end
        else
            player:sendCancelMessage("Your training has stopped.")
            player:sendTextMessage(MESSAGE_INFO_DESCR, "Youy training has stopped.")
            stopEvent(training)
            player:setStorageValue(isTraining, 0)
            player:setStorageValue(Storage.isTraining, 0)
        end
    else
        stopEvent(training)
        player:sendCancelMessage("Your training has stopped.")
        player:setStorageValue(isTraining, 0)
        if player then -- verificar se o player ainda existe (logado), caso esteja, enviar mensagem de erro e parar treino. isso evita erros no console
            player:sendTextMessage(MESSAGE_INFO_DESCR, "Youy training has stopped.")
            player:setStorageValue(Storage.isTraining, 0)
        end
    end
    return true
end
 
function onUse(player, item, fromPosition, target, toPosition, isHotkey)
    local start_pos = player:getPosition()
    if player:getStorageValue(Storage.isTraining) == 1 then
        player:sendTextMessage(MESSAGE_INFO_DESCR, "You are already training.")
        return false
    end
    if target:isItem() then
        if isInArray(dummies,target:getId()) then
            if not skills[item.itemid].range and (start_pos:getDistance(target:getPosition()) > 1) then
                player:sendCancelMessage("Get closer to the dummy.")
                player:sendTextMessage(MESSAGE_INFO_DESCR, "Get closer to the dummy.")
                stopEvent(training)
                return true
            end
            if player:getStorageValue(isTraining) == 1 then
                player:sendCancelMessage("You are already training.")
                return false
            end
            player:sendCancelMessage("You started training.")
            player:sendTextMessage(MESSAGE_INFO_DESCR, "You started training.")
            start_train(player:getId(),start_pos,item.itemid,target:getPosition())
        end
    return true
    end
end

But running into this problem, don't know how to define storage value

Lua Script Error: [Action Interface]
data/actions/scripts/ExerciseTraining/exercise_training.lua:onUse
data/actions/scripts/ExerciseTraining/exercise_training.lua:70: attempt to index global 'Storage' (a nil value)
stack traceback:
        [C]: in function '__index'
        data/actions/scripts/ExerciseTraining/exercise_training.lua:70: in function <data/actions/scripts/ExerciseTraining/exercise_training.lua:68>

Thank you in advance, we have tried various different ways but dont seem to find the correct one.