Holo script not Working? Changed

My holo script isnt working. I changed :GetRoleInGroup() to :GetRankInGroup to fix that problem but i found that there is something wrong with how the onChat function is called at the end of the script but i dont know what it is. Here's the updated script:

groupid=1209141
rankmin=10
open=false
hatchopen=false
first={}
success="Request completed"
notfound="Unable to complete request//Map Not Found"
notthere="Unable to complete request//Gamemode Does Not Exist"
gamemodes="ffa, teammatch"
maplist="hardobby, classic, paths"
lobby=math.random(-30.5,14.5),42.5,math.random(-969,-980)

function mode(mode,pr)
	if mode=="ffa" and open=true then
		teleport(arena)
	end
end

function success(per)
	local m=Instance.new("Message",per.Character)
	m.Text=success
	wait(1.5)
	m:Destroy()
end

function errr(err,pers)
	error(err)
	if err==notfound then
		local m=Instance.new("Message",pers.Character)
		m.Text=notfound
		wait(1.5)
		m.Text=("The current maps are:"..maplist)
		wait(2.5)
		m:Destroy()
	end
	
	if err==notthere then
		local m=Instance.new("Message",pers.Character)
		m.Text=notthere
		wait(1.5)
		m.Text=("The current gamemodes are:"..gamemodes)
		wait(2.5)
		m:Destroy()
	end
end

function loadmap(map,payer)
	local find=game.Workspace:FindFirstChild(map)
	if find~=nil then
		open=true
		find:Clone().Parent=game.Workspace.map
		wait(0.2)
		success(payer)
	end
	if find==nil then
		errr(notfound,payer)
		open=false
	end
end

function endmap(plr)
	local fd=game.Workspace.map:GetChildren()
	for i=1,#fd do
		
	end
end

function teleport(place)
	local plays=game.Players:GetPlayers()
	for i=1,#plays do
		plays[i].Torso.CFrame=CFrame.new(place)
	end
end

game.Players.ChildAdded:connect(function(player)
	function onChat(message,player)
		
		if message=="!end session" and player:GetRankInGroup(groupid)>=10 then
			local m=Instance.new("Message",game.Workspace)
			m.Text="Thank you for coming to "..first.."'s Training"
			game.Players:ClearAllChildren()
		end
		
		if message=="!start session" and player:GetRankInGroup(groupid)>=10 then
			teleport(lobby)
		end
			
		if message:sub(1,5)=="!load " and player:GetRankInGroup(groupid)>=10 then
			loadmap(message:sub(6),player)
		end
			
		if message:sub(1,4)=="!end " and player:GetRoleInGroup(groupid)>=10 then
			endmap(message:sub(5),player)
		end
				
		if message:sub(1,5)=="!mode " and player:GetRankInGroup(groupid)>=10 then
			mode(message:sub(6,player))
		end
	end
end)

game.Players.PlayerAdded:connect(function(player)
	player.Chatted:connect(function(message) onChat(message,player)
		if player:GetRankInGroup(groupid)>=10 and #first<1 then
			table.insert(first,player.Name)
			print("You're an admin")
		end
	end)
end)