Parent Problem!?? ?

Can someone try fix this ? I think the parent is broken or something, It isn't goin under my feet :l There no error's in the output :l

local Me=game.Players.LocalPlayer
local Players=Me.Name
script.Parent=nil
local Workspace=game:GetService('Workspace')

local Mod=Instance.new('Model',game.Workspace[Players])
Mod.Name='Fade'
local tab=Instance.new('Part',Mod)
tab.Size=Vector3.new(5,1,5)
tab.BrickColor = BrickColor.new("Toothpaste")
tab.Transparency=0.9
tab.BottomSurface = 0
tab.TopSurface = 0
tab.Anchored=true
tab.Name='lol'
tab.CanCollide=true
Bubble = Instance.new("ParticleEmitter")
Bubble.Parent = tab
Bubble.Size.Value = 1.5
Bubble.Transparency.Value = 0
Bubble.LightEmission.Value = 0
Bubble.Color.Value = 255,255,255
Bubble.Acceleration.Value = 0,5,0
Bubble.Lifetime.Min.Value = 0.5
Bubble.Lifetime.Max.Value = 0.5
Bubble.Speed.Value = 3
Bubble.Texture = "http://www.roblox.com/asset/?id=217001241"

local Surface=Instance.new('SurfaceGui',tab)
Surface.Name='Test'
local Frame=Instance.new('Frame',Surface)
Frame.Size=UDim2.new(0,800,0,200)
Frame.BackgroundTransparency=1


--[[Positioning]]--
game:GetService('RunService').RenderStepped:connect(function()
tab.Position=Me.Character.Head.Position + Vector3.new(0,-5.2,0)
end)