resources/scripts/main.lua:5: bad argument #3 to 'AddCallback' (function expected,

local mod= RegisterMod("ReSprite", 1)
local strowBewwy = Isaac.GetItemIdByName("Strow Bewwy")
local strowBewwyDamage = 3

function mod:EvaluateCache(player, cacheFlags)
    if cacheFlags & CacheFlag.CACHE_DAMAGE == CacheFlag.CACHE_DAMAGE then
        local itemcount = player:GetCollectibleNum(strowBewwy)
        local damageToAdd = strowBewwyDamage * itemcount
        player.Damage = player.Damage + damageToAdd
    end
end

mod.AddCallback(ModCallbacks.MC_EVALUATE_CACHE, mod.EvaluateCache)