LUA错误：尝试对布尔值进行算术运算

  ```  local xpNeed = 100; -- 例如，100 * 等级 = 你需要晋升所需的经验值！
    addEvent("onPlayerLevelUp", true);

    function addPlayerXp(player, xp)
        local acc = getPlayerAccount(player);
        local oldexp = getAccountData(acc, "exp") or 0;
        local oldlvl = getAccountData(acc, "lvl") or 1;
        local newlevel = oldlvl + 1;
        local newexp = oldexp + xp;
        lvl = getAccountData(acc, "lvl") or 0;
        if getElementData(player,'lvl') > 9 then return end
        setAccountData(acc, "exp", newexp);
        setElementData(player, "exp", newexp);
        --if getAccountData(acc,'lvl') > 9 then return end
            if (newexp >= (oldlvl * xpNeed)) then
            local expleft = newexp - (oldlvl * xpNeed); -- 添加升级后可能仍存在的经验值计算。
            outputChatBox("[升级] 恭喜！新等级 "..newlevel.."！", player, 66, 134, 244);
            setAccountData(acc, "lvl", newlevel);
            setAccountData(acc, "exp", expleft);
            setElementData(player, "exp", expleft);
            setElementData(player, "lvl", newlevel);
            triggerEvent("onPlayerLevelUp", player, newlevel, oldlvl, oldexp, newexp);
        end
    end
    addEventHandler("onPlayerLogin", root, function()
        local acc = getPlayerAccount(source);
        if acc then
            setElementData(source, "lvl", getAccountData(acc, "lvl") or 0);
            setElementData(source, "exp", getAccountData(acc, "exp") or 0);
        end
    end);

    addEventHandler("onZombieGetsKilled", root, function(killer)
        if killer and getElementType(killer) == "player" then
            addPlayerXp(killer, 50);
        end
    end);

    addEventHandler("kilLDayZPlayer", root, function(killer)
        if (killer and killer ~= source and getElementType(killer) == "player") then
            addPlayerXp(killer, 50);
        end
    end);

    --[[
    addEventHandler("onPlayerSpawn", root, function(newlvl)
        if newlvl then
        if (lvl) > 1 then
                setElementData(player, "MP5A5", 1)
            elseif lvl > 2 then
                setElementData(player, "Tent", 1)
            elseif lvl > 3 then
                setElementData(player, "Milk", 1)
            elseif lvl > 4 then
                setElementData(player, "Medic Kit", 1)
            elseif lvl > 5 then
                setElementData(player, "Shovel", 1)
            end
        end
    end);

    ]]

    table = {"Milk","MP5A5","M4A1-S","AK-47","Soda Bottle","Pizza","AS50","Tent","Medium Tent","ACR","AR-15","M107","Pasta Can","Beans Can","Golf Club"}

    addEventHandler("onPlayerSpawn", root, function(lvl)
        if not lvl then lvl = getElementData(player, "lvl") or 0; end
        if lvl > 1 then
            for i = 1, lvl do
                setElementData(player, table[i], getElementData(player, table[i]) + 1);
            end
        end
    end);
```

你好，这是我在这里的第一篇帖子，所以我想问你好。所以，作为一个初学者程序员，我正在尝试为我的mta服务器实现一个级别系统，但是，我遇到了标题中所述的障碍。这个布尔值在哪里？我应该怎么办才能使它起作用？如果这个问题看起来很琐碎（因为它确实是），但我真的想往前走。任何帮助都将不胜感激。先感谢您的帮助！

在setElementData(player, table[i], getElementData(player, table[i]) + 1);中出现错误，我能做什么来使它工作？任何帮助都将不胜感激

错误行70：尝试对布尔值进行算术运算 和警告相同行

getElementData中的错误参数[在第1个参数中期望元素，而得到nil]