why Mouse is nil value in my script??? please answer

this script in serverscriptservice and its not working its an event script

console.script1Beast.OnServerEvent:connect(function(p, Mouse)
    --creation by missingboshjio
--for r6
local a
local b
local c
local d
local e
local f
local g
local h
local version = {"1.0"}

local c = p.Character
local hum = c.Humanoid
local m = Mouse
local t = c.Torso
local hrp = c.HumanoidRootPart
local hed = c.Head
local ril = c["Right Leg"]
local lel = c["Left Leg"]
local ria = c["Right Arm"]
local lea = c["Left Arm"]
local targetI = nil
local intro = true
local death = false

spawn(function()
    while wait() do
        hed.BrickColor = BrickColor.new("Maroon")
        ria.BrickColor = BrickColor.new("Maroon")
        lea.BrickColor = BrickColor.new("Maroon")
        t.BrickColor = BrickColor.new("Maroon")
        ril.BrickColor = BrickColor.new("Maroon")
        lel.BrickColor = BrickColor.new("Maroon")
        local ff = Instance.new("ForceField")
        ff.Parent = t
        wait()
        ff.Parent = hrp
        ff.Visible = false
        local fire = Instance.new("Fire", t)
        fire.Heat = 5
        fire.Size = 5
        fire.Color = Color3.new(117,0,0)
        wait(0.1)
        t.Anchored = true
        local crown = Instance.new("Part", c)
        crown:BreakJoints()
        crown.CanCollide = false
        crown.Name = "crown"
        crown.Transparency = 0.9
        crown.Size = Vector3.new(100,25,100)
        crown.BrickColor = BrickColor.new("Maroon")
        local crownmesh = Instance.new("SpecialMesh", crown)
        crownmesh.Name = "crownmesh"
        crownmesh.MeshId = "http://www.roblox.com/asset/?id=1078075"
        crownmesh.Scale = Vector3.new(100,25,100)
        local crownweld = Instance.new("Weld", crown)
        crownweld.Name = "crownweld"
        crownweld.Part0 = t
        crownweld.Part1 = crown
        wait(0.1)
        crown.Transparency = 0.8
        wait(0.1)
        crown.Transparency = 0.7
        wait(0.1)
        crown.Transparency = 0.6
        wait(0.1)
        crown.Transparency = 0.5
        wait(0.1)
        crown.Transparency = 0.4
        wait(0.1)
        crown.Transparency = 0.3
        wait(0.1)
        crown.Transparency = 0.2
        wait(0.1)
        crown.Transparency = 0.1
        wait(0.1)
        crown.Transparency = 0
        wait(2)
        local ex = Instance.new("Part", c)
        ex:BreakJoints()
        ex.CanCollide = false
        ex.Name = "explosion"
        ex.Transparency = 0
        ex.Size = Vector3.new(1,1,1)
        ex.BrickColor = BrickColor.new("Really red")
        ex.Material = Enum.Material.Neon
        ex.Shape = "Ball"
        local exweld = Instance.new("Weld", crown)
        exweld.Name = "exweld"
        exweld.Part0 = t
        exweld.Part1 = ex
        local explosionsound = Instance.new("Sound", ex)
        explosionsound.SoundId = "rbxassetid://2770705399"
        explosionsound.Volume = 5
        explosionsound.PlaybackSpeed = 0.5
        explosionsound:Play()
        wait(0.5)
        ex.Size = Vector3.new(10,10,10)
        wait(0.5)
        ex.Size = Vector3.new(25,25,25)
        wait(0.5)
        ex.Size = Vector3.new(50,50,50)
        wait(0.5)
        ex.Size = Vector3.new(75,75,75)
        wait(0.5)
        ex.Size = Vector3.new(90,90,90)
        wait(0.5)
        ex.Size = Vector3.new(100,100,100)
        wait(0.5)
        ex:Destroy()
        crown:Destroy()

        local sound = Instance.new("Sound", t)
        sound.Name = "lol"
        sound.Looped = true
        sound.SoundId = "rbxassetid://2526061641"
        sound:Play()

        while true do
            wait(1)
            t.Anchored = false
            hed.face.Texture = "http://www.roblox.com/asset/?id=328783763"
            hum.WalkSpeed = 25
        end
    end
end)

local txt = Instance.new("BillboardGui", c)
txt.Adornee = hed
txt.Name = "nil2"
txt.Size = UDim2.new(2, 0, 1.2, 0)
txt.StudsOffset = Vector3.new(-7.2, 3.5, 0)
local text = Instance.new("TextLabel", txt)
text.Size = UDim2.new(10, 0, 7, 0)
text.FontSize = "Size12"
text.TextColor3 = Color3.new(117,0,0)
text.TextScaled = false
text.TextTransparency = 0
text.BackgroundTransparency = 1
text.TextTransparency = 0
text.TextStrokeTransparency = 1
text.Font = Enum.Font.GothamBold
text.TextStrokeColor3 = Color3.new(0, 0, 0)
text.Text = "-- Beast"

m.Button1Down:connect(function()
    local hitbox = Instance.new("Part", ria)
    hitbox.Transparency = 1
    hitbox.CFrame = ria.CFrame
    hitbox.Parent = c
    hitbox.Name = "hitbox"
    hitbox.Size = Vector3.new(2,2,2)
    hitbox.CFrame = ria.CFrame
    hitbox:BreakJoints()
    hitbox.CanCollide = false
    hitbox.BrickColor = BrickColor.new("Medium Stone")
    hitbox.TopSurface = "Smooth"
    hitbox.BottomSurface = "Smooth"
    hitboxweld = Instance.new("Weld")
    hitboxweld.Name = " "
    hitboxweld.Part0 = ria