I keep getting this error, And it doesn't really make sense to me?

So this script is in a local script inside of a tool, and I keep getting this error: 16:17:46.660 - Players.Player1.Backpack.MagicCircle Test.LocalScript:20: attempt to index upvalue 'pc' (a nil value)

I don't get what the error is for/caused by? And I also don't know how to fix it.

local player = game.Players.LocalPlayer
local pc = player.Character
local d = false




script.Parent.Activated:connect(function()
	if d ~= true and game.Workspace:FindFirstChild("CircleBlock") == nil then
		d = true
		local cb = Instance.new("Part")
			cb.Name = "CircleBlock"
			cb.Size = Vector3.new(0, .25, 0)
			cb.Anchored = true
			cb.CanCollide = false
			cb.Transparency = 1
			cb.Parent = workspace
			cb.CFrame = pc.Torso.CFrame * CFrame.new(0, -2.8, 0)
		local cr = game.ReplicatedStorage.MyScripts.RotationScript:Clone()
			cr.Parent = cb
		local cs = Instance.new("Decal")
			cs.Face = "Top"
			--cs.Texture = "http://www.roblox.com/asset/?id=412956943"
			cs.Texture = "http://www.roblox.com/asset/?id=268043891"
			cs.Parent = cb
		local cs2 = Instance.new("Decal")
			cs2.Face = "Bottom"
			--cs.Texture = "http://www.roblox.com/asset/?id=412956943"
			cs2.Texture = "http://www.roblox.com/asset/?id=268043891"
			cs2.Parent = cb
		for i = 1, 50 do
			cb.Size = cb.Size + Vector3.new(2, 0, 2)
			wait()
		end
		wait(3)
		for i = 1, 10 do
			cb.CFrame = cb.CFrame * CFrame.new(0, i/8, 0)
			wait(.15)
		end
		wait(.5)
		cb:Destroy()
		cs:Destroy()
		cs2:Destroy()
	end
	d = false
end)