Bullet script to Filtering Enabled?

My gun is working but on online, gun isnt working help me

ball = script.Parent
damage = math.random(12,18)



function onTouched(hit)
    local humanoid = hit.Parent:findFirstChild("Enemy")

    if hit.Parent.className == "Hat" or hit.Parent.className == "Tool" or hit.CanCollide == false then return end

    if hit.Name == "Bullet" then return end

    if humanoid ~= nil then
        tagHumanoid(humanoid)
        if hit.Name == "Head" then
            humanoid:TakeDamage(damage * 3)
        elseif hit.Name == "Torso" then
            humanoid:TakeDamage(damage * 1)
        end
        wait(2)
        untagHumanoid(humanoid)
    end

    connection:disconnect()
    ball.Parent = nil
end

function tagHumanoid(humanoid)
    -- todo: make tag expire
    local tag = ball:findFirstChild("creator")
    if tag ~= nil then
        local new_tag = tag:clone()
        new_tag.Parent = humanoid
    end
end


function untagHumanoid(humanoid)
    if humanoid ~= nil then
        local tag = humanoid:findFirstChild("creator")
        if tag ~= nil then
            tag.Parent = nil
        end
    end
end

connection = ball.Touched:connect(onTouched)

wait(4)
ball.Parent = nil