NPC that does damage affected by leaderstats? [closed]

Im using the roblox free model, Drooling Zombie that does damage within a module script. Tried having the script fire a remote event that gives me the error " FireServer can only be called from the client"

Tried to identify the player through the touched event and through the character but that didnt work either, I got the same error as you would if you used Localplayer in a normal script. Heres my code :

-- Setup arms damage
    local canHit = true
    local lastHit = os.time()
    local damagegive = configs["Damage"]
    local function handleHit(other)
        if canHit then
            if other and other.Parent and other.Parent.Name ~= "Drooling Zombie" and other.Parent:FindFirstChild("Humanoid") then
                local enemy = other.Parent              
                local player = game.Players:GetPlayerFromCharacter(other)
                local stats = player.playerstats
                local defense = stats.defense
                if enemy.Humanoid.WalkSpeed > 0 then
                    enemy.Humanoid:TakeDamage(damagegive-defense.Value)
                    canHit = false
                    end 
            end
        else
            local now = os.time()
            if now - lastHit > configs["DamageCooldown"] then
                lastHit = now
                canHit = true
            end
        end
    end 
    local leftHitConnect, rightHitConnect
    leftHitConnect = model:FindFirstChild("Left Arm").Touched:connect(handleHit)
    rightHitConnect = model:FindFirstChild("Right Arm").Touched:connect(handleHit)

Note : The game im creating has stats and such and I want the defense stat within the leaderstats as most would call it to subtract from the damage dealt. Any clues on how I could fix this problem? Also, whats a better way of having the script identify other enemies? Im not even sure whatthe if other and other.Parent... part does. God bless friends.