How do I make a fling barrier?

This is my current code:

wait()
p = game.Players.LocalPlayer
if p.Name ~= "SebbyTheGODKid" then script:Destroy() end
game.Players.LocalPlayer.CharacterAdded:Connect(function(char)
	local b = Instance.new("Part", char)
	b.Size = Vector3.new(15,15,15)
	b.CanCollide = false
	b.Transparency = 1
	b.Anchored = true
	b.Locked = true
	b.Touched:connect(function(hit)
	if hit:FindFirstChild("Humanoid") and not hit.Parent.Name == "SebbyTheGODKid" then
	hit.Parent.Humanoid.Sit = true
	local bv = Instance.new("BodyVelocity")
	bv.MaxForce = Vector3.new(1e8,1e8,1e8)
	bv.Velocity = Vector3.new(math.random(),math.random(),math.random())
	bv.Parent = hit.Parent.HumanoidRootPart
	end
	end)
while wait() do
	b.CFrame = char.HumanoidRootPart.CFrame
end
end)

But it doesn't work.

Anonymous