Help my localscript is working and not working sometimes Anybpdy?

I was confused about my script because it said my Part [MeshPart1] is not valid but the true name can someone help me with this, please? Sorry For My Grammar

Script Doesn't work https://gyazo.com/1574276b5eebc6908e13ad30df9d1b75 Script Work https://gyazo.com/9cf20bf978877690355c096234df8c8e

player = game.Players.LocalPlayer
repeat wait(0.001) until player.Character
character = player.Character
CanSwing = true

animation = character.Humanoid:LoadAnimation(script.Parent.Animation)
Parent = script.Parent  

script.Parent.Activated:Connect(function()

    if CanSwing == true then
        CanSwing = false
        animation:Play()
        local plr = game.Players.LocalPlayer
        local char = plr.Character
        local hum = char.Humanoid
        hum.WalkSpeed = 0
        hum.JumpPower = 0
        wait(0.5)
        Parent.Part.Sparkles.Enabled = true
        wait(0.3)
        Parent.Handle.ParticleEmitter.Enabled = true
        wait(0.6)
        Parent.MeshPart1.Specks.Enabled = true
        wait(0.8)
        Parent.Part.Sparkles.Enabled = false
        wait(0.0000000000000000000000001)
        Parent.MeshPart1.Specks.Enabled = false
        wait(0.6)
        Parent.Handle.ParticleEmitter.Enabled = false
        wait(0.1)
        Parent.Parent.Tool:Destroy()
        wait(2)
        CanSwing = true
        hum.WalkSpeed = 16
        hum.JumpPower = 50
        Parent.LocalScript:Destroy()
    end
end)