Why does this script not working?

I was making a gun and it worked in solo mode but not in the server mode. I tried to make it work but it doesn't work.

Bin = script.Parent
player = game.Players.LocalPlayer
camera = game.Workspace.CurrentCamera
mouse = player:GetMouse()
BulletSpeed = script.Parent.Configuration.BulletSpeed.Value

function Light()
    script.Parent.Light.Transparency = 0.5
    script.Parent.Light.SpotLight.Enabled =  true
    script.Parent.Shoot:Play()
    wait()
    script.Parent.Light.Transparency = 1
    script.Parent.Light.SpotLight.Enabled =  false
end

function FOVIn()
    camera.FieldOfView = camera.FieldOfView - 5
end

function FOVOut()
    camera.FieldOfView = camera.FieldOfView + 5
end

function weld()
    local parts,last = {}
    local function scan(parent)
        for _,v in pairs(parent:GetChildren()) do
            if (v:IsA("BasePart")) then
                if (last) then
                    local w = Instance.new("Weld")
                    w.Name = ("%s_Weld"):format(v.Name)
                    w.Part0,w.Part1 = last,v
                    w.C0 = last.CFrame:inverse()
                    w.C1 = v.CFrame:inverse()
                    w.Parent = last
                end
                last = v
                table.insert(parts,v)
            end
            scan(v)
        end
    end
    scan(script.Parent)
    for _,v in pairs(parts) do
        v.Anchored = false
    end
end

function Shoot()
    local Ammo = player.PlayerGui.FPS.Ammo
    local H = player.PlayerGui.Status.StatusFrame.Health.Text
    local Cooldown = false
    if Cooldown == false then
        if tonumber(Ammo.Text.Text) == 0 then
            script.Parent.Reloading.Value = true
            Reload = player.Character.Humanoid:LoadAnimation(script.Parent.GunReload)
            Reload:Play()
            Ammo.Text.Text = "Reloading"
            Ammo.Bar:TweenSize(UDim2.new(0,300,1,0),"InOut","Quad",4)
            script.Parent.ChangeReload.Disabled = false
        elseif script.Parent.Reloading.Value == false then
            local Bullet = Instance.new("Part",game.Workspace)
            Bullet.FormFactor = "Custom"
            Bullet.Size = Vector3.new(0.1,0.1,0.1)
            Bullet.Position = script.Parent.Hole.Position
            Bullet.CFrame = CFrame.new(Bullet.Position,mouse.Hit.p)
            Bullet.BrickColor = BrickColor.new("Really black")
            Bullet.CanCollide = false
            local Rocket = Instance.new("BodyVelocity",Bullet)
            Rocket.maxForce = Vector3.new(math.huge,math.huge,math.huge)
            Rocket.velocity = Bullet.CFrame.lookVector * BulletSpeed
            findScript = Bullet:FindFirstChild("TakeDamage")
            if TakeDamage == nil then
                local Script = script.TakeDamage:Clone()
                Script.Parent = Bullet
                Script = script.TakeDamage:Clone()
                Script.Parent = Bullet
                Val = script.Parent.Configuration.Damage:Clone()
                Val.Parent = Script
                Script.Creator.Value = player.Name
                Script.Disabled = false
            end
            Ammo.Text.Text = Ammo.Text.Text - 1
            Ammo.Bar.Size = UDim2.new(0,tonumber(Ammo.Text.Text) * 10 * 3,1,0)
            Light()
            script.Parent.Shoot:Play()
            Cooldown = true
            wait(0.2)
            Cooldown = false
        end
    end
end

function UnEquipped()
    player.CameraMode = "Classic"
    script.Disabled = true
end

weld()

Bin.Activated:connect(Shoot)
Bin.Unequipped:connect(UnEquipped)
mouse.WheelForward:connect(FOVIn)
mouse.WheelBackward:connect(FOVOut)