Mouse Cursor isn't loading?

I made a script to my game, and its supose to make a gun, but it is not working. I started getting this error: 18:28:05.943 - Image "https://assetgame.roblox.com/asset/?id=358948941" failed to load in "Mouse Cursor": Request failed

Here's my script:

-- Algumas variaveis --
local pistola = script.Parent
local hole = pistola:WaitForChild("Hole")
local mouse = game.Players.LocalPlayer:GetMouse()

-- Lista de Valores --
local ammo = 12
local maxAmmo = 64
local damage = 20
local headshotDamage = 50
local range = 100
local coolDown = 0.5

-- impedir spamming --
local spam = false

-- Mudar o rato --
pistola.Equipped:Connect(function()
    mouse.Icon = "rbxassetid://358948941"
end)

pistola.Unequipped:Connect(function()
    mouse.Icon = ""
end)

-- Disparo --
pistola.Activated:Connect(function()
    if spam == false then
         spam = true
        pistola.Handle.Disparo:Play()
       local bullet = Instance.new("Part")
       bullet.Size = Vector3.new(range,0.25,0.25)
       local ray = Ray.new(hole.CFrame.Position, (mouse.Hit.Position - hole.CFrame.Position).Unit*range)
       local hit, position = workspace:FindPartOnRay(ray, game.Players.LocalPlayer.Character)
       local distance = (pistola.Handle.CFrame.p - position).magnitude
       bullet.CFrame = CFrame.new(pistola.Handle.CFrame.p, position) * CFrame.new(0,0, distance/2)
       bullet.Transparency = 0.5
       bullet.CanCollide = false
       bullet.Anchored = true
       bullet.Parent = game.Workspace
       bullet.Orientation = hole.Orientation
       bullet.Position = hole.Position
    game:GetService("Debris"):AddItem(bullet, 0.5) 
        spam = false
    end 
end)

Also pistola = gun. XD

Here's a video of what my gun is doing : http://gyazo.com/1cf05bb4a57ad9a37866f40546380fd7

Could you help me fixing this? (also send a answer, not a comment :/ i think i shouldn't have to say this but ppl always send comment insteed of answers :/)