Can someone help me out? idk what i did wrong

----- fireball script

local player = script.Parent.Parent
local mouse = player:GetMouse()
enabled = false

function onKeyDown(key)
    key = key:lower()
    if key == "f" and not enabled then --f for fireball
        fireball = Instance.new("part")
        fireball.Shape = "Ball"
        fireball.BrickColor = BrickColor.new("Really red")
        fireball.Transparency = 0.3
        fireball.TopSurface = "Smooth"
        fireball.BottomSurface = "Smooth"
        fireball.CFrame = Player.Character.Torso.CFrame *CFrame.new(0,0,-5)
        fireball.Parent = game.Workspace
        local mesh = Instance.new("SpecialMesh",fireball)
        mesh.MeshType = "Sphere"
        local fire = Instance.new("fire",fireball)
        fire.Heat = 8
        fire.Size = 10
        local bv = Instance.new("BodyVelocity")
        bv.maxForce = Vector3.new(math.huge.math.huge.math.huge)
        bv.velocity = player.Character.Torso.CFrame.lookVector*80
        for i = 1,13 do 
            fireball.Mesh.Scale = fireball.Mesh.Scale +Vector3.new(0.1,0.1,0.1)
            wait()
        end
        bv.Parent = fireball
        fireball.CanCollide = false
    end
end

mouse.KeyDown:connect(OnKeyDown)