Got a weird error, how would I go about fixing this?

-----Group 1----
GroupId = 921838
min = 1 
max = 255 
-----Group 2----
GroupId2 = -1 
min2 = -1 
max2 = -1
--Specific Settings-- 
Door = script.Parent 
Debounce = false 
local teleportto = game.Workspace.OutsideDoor
local location = {teleportto.Position}
local x = location[1].x
local y = location[1].y
local z = location[1].z
											 ----------
 											 --Script--
											 ---------- 
function Touched(Part)
	local Human = Part.Parent:findFirstChild("Humanoid")
        if Human ~= nil then
	print("Work")
if Debounce then return end
Debounce = true 
if Part.Parent then
	print("Work2")
		print("Work3.1")
if Human.Parent:GetRankInGroup(GroupId) >= min and Human.Parent:GetRankInGroup(GroupId) <= max or Human.Parent:GetRankInGroup(GroupId2) >= min2 and Human.Parent:GetRankInGroup(GroupId2) <= max2 then
	print("work4")
Human.Parent.Character.Torso.CFrame = CFrame.new(Vector3.new(x,y,z))
    print("Work5")
else
Part.Parent:breakJoints()
script.Parent.Denied:play()
end end end Debounce = false
Door.Touched:connect(Touched)

So what I am trying to do is make a new group only door, but this is the error I get. The parts that the player will get teleported are linked correctly. And what I mean by that is that they are in the right spot in the game explorer. The below answer did help but now a new error has arisen, sorry for the inconvenience and question asking. :( Any help is appreciated! :D

21:05:46.604 - GetRankInGroup is not a valid member of Model
21:05:46.606 - Script 'Workspace.Group Rank Only Door V1.5.1.Door.Group Rank Based', Line 29

Human.Parent is a character model in the Workspace. However, :GetRankInGroup() only works for the Player Instance under game.Players. So, perhaps something like this would work:

local plr = game.Players:GetPlayerFromCharacter(Human.Parent)
if plr:GetRankInGroup(GroupId) >= min and 
plr:GetRankInGroup(GroupId) <= max or
-- etc.

Notice how Human.Parent is replaced with plr, allowing you to get the player's rank in the group. Hope this helps :)