Why doesn't the script recognize the player?

I made a script that fires a bindable event whenever I shoot:

local Blaster = script.Parent
local BlasterShot = Blaster:WaitForChild("Sound")
local Player = game.Players:GetPlayerFromCharacter(Blaster.AncestryChanged:Wait().Parent)
local Mouse = Player:GetMouse()
Mouse.Icon = "rbxassetid://6725953862"
local ReplicatedStorage = game.ReplicatedStorage
local Event = ReplicatedStorage.FiringEvent
local Shooting = false
Blaster.Equipped:Connect(function()
    Mouse.Button1Down:Connect(function()
        Shooting = true
        while Shooting do
            Event:Fire(Blaster.Handle.Position, Blaster.Handle.Orientation, Mouse.Hit.p)
            BlasterShot:Play()
            Mouse.Button1Up:Connect(function()
                Shooting = false
            end)
            wait(.01)
        end
    end)
end)

It gives me an error: Players.sidb0102.Backpack.A-280.GunScript:4: attempt to index nil with 'GetMouse' I don't understand. I thought it would fire when I equipped it, Right?