Why isnt the door opening?

Hello there! I'm making a game and I need to make a door that is whitelisted so only people over the guest and cadet rank can open and close it. My game is filtering enabled and has to switch back and forth from the client and the server. I learned this month about remote events/remote functions (except I don't know much about remote functions) and tried to use them in this.

But it's not working. I tried to fix it but on line 10 on the open script it gives me this error

Argument 1 missing or nil

Can anyone help me?

Here are the scripts and parts.

Scripts:

Type of script = Script, Name of script = Open:

local CD = script.Parent.ClickDetector
local RS = game:GetService("ReplicatedStorage")
local RE = RS.RemoteEvents

local Debounce = false

if script.Parent.ClickDetector.MouseClick then
	if Debounce == false then
		Debounce = true
		RE.DoorAClickCheck:FireClient()
		wait(0.5)
	end
end

RE.DoorAOpen.OnServerEvent:Connect(function()
	if script.Parent.OpenValue == false then
		script.Parent.Transparency = 0.5
		script.Parent.CanCollide = false
	end
	if script.Parent.OpenValue == true then
		script.Parent.Transparency = 0
		script.Parent.CanCollide = true
	end
end)

Type of script = LocalScript, Name of script = LocalOpen:

local CD = script.Parent.ClickDetector
local RS = game:GetService("ReplicatedStorage")
local RE = RS.RemoteEvents
local Player = game.Players.LocalPlayer

RE.DoorAClickCheck.OnClientEvent:Connect(function()
	if Player.leaderstats.Rank == "Guest" or "Cadet" then
		print("Rejected: Not Over Rank 2")
	else
		RE.DoorAOpen:FireServer()
	end
end)

Remote events (These are in replicated storage and are both remote events. {I also have these duplicated but it is DoorB because I'm making another one of these doors.}) : DoorAClickCheck and DoorAOpen

Parts: DoorA

Inside of DoorA: ClickDetector, Open, OpenValue, And LocalOpen

Thanks for reading and or helping me,

Narwhal

When you use :FireClient() you need to put the player inside the () example :

FireClient(plr)

you can also put an argument example:

 FireClient(plr, "yo") 

https://developer.roblox.com/en-us/api-reference/function/RemoteEvent/FireClient

It would become like this:

script.Parent.ClickDetector.MouseClick:Connect(function(plr)
    if Debounce == false then
        Debounce = true
        RE.DoorAClickCheck:FireClient(plr)
        wait(0.5)
    end
end)

You have to specify the plr

RE.DoorAClickCheck:FireClient(game.Players.UsernameWitheld)

heres it rewritten

local CD = script.Parent.ClickDetector
local RS = game:GetService("ReplicatedStorage")
local RE = RS.RemoteEvents

local Debounce = false

 script.Parent.ClickDetector.MouseClick(plxr)
    if Debounce == false then
        Debounce = true
        RE.DoorAClickCheck:FireClient(plxr)
        wait(0.5)
Debounce=false
    end
end

RE.DoorAOpen.OnServerEvent:Connect(function()
    if script.Parent.OpenValue == false then
        script.Parent.Transparency = 0.5
        script.Parent.CanCollide = false
    end
    if script.Parent.OpenValue == true then
        script.Parent.Transparency = 0
        script.Parent.CanCollide = true
    end
end)