attempt to index field 'PrimaryPart' (a nil value)?

Hello! So I'm trying to make a keycard door that opens but when I touch it with my keycard it gives my the error in the title. Here is my code:

local db= false
local open = script.Parent.Parent.Open
script.Parent.Parent.Trigger.Touched:Connect(function(p)
	if db == false then
		db = true
		if p.Parent:FindFirstChild("Card") ~= nil then
			if open.Value == false then
				local f = script.Parent.Parent.Door1.PrimaryPart.CFrame*CFrame.Angles(0,-math.rad(90),0)
				local f2 = script.Parent.Parent.Door2.PrimaryPart.CFrame*CFrame.Angles(0,math.rad(90),0)
				for i = 0,1,0.1 do
					local cfm = script.Parent.Parent.Door1.PrimaryPart.CFrame:lerp(f,i)
					local cfm2 = script.Parent.Parent.Door2.PrimaryPart.CFrame:lerp(f2,i)
					script.Parent.Parent.Door1:SetPrimaryPartCFrame(cfm)
					script.Parent.Parent.Door2:SetPrimaryPartCFrame(cfm2)
					wait()
				end
				open.Value = true
				wait(3) -- how long does the doors open
				local f3 = script.Parent.Parent.Door1.PrimaryPart.CFrame*CFrame.Angles(0,math.rad(90),0)
				local f4 = script.Parent.Parent.Door2.PrimaryPart.CFrame*CFrame.Angles(0,-math.rad(90),0)
				for i = 0,1,0.1 do
					local cfm = script.Parent.Parent.Door1.PrimaryPart.CFrame:lerp(f3,i)
					local cfm2 = script.Parent.Parent.Door2.PrimaryPart.CFrame:lerp(f4,i)
					script.Parent.Parent.Door1:SetPrimaryPartCFrame(cfm)
					script.Parent.Parent.Door2:SetPrimaryPartCFrame(cfm2)
					wait()
				end
				open.Value = false
			end
		else
			print("User has no card")
		end
		db=false
	end
end)