I need help for a team group rank gui this is my script but it is not working help would be nice ?

I need help for a team group rank gui this si my script but it is not working

local groupId = 7635145	 
game.Players.PlayerAdded:Connect(function(Player)
	Player.CharacterAdded:Connect(function(Character)
	local GuiClone = script.OverheadGui:Clone()
	GuiClone.Parent = Character.Head
	local InformationLabel = GuiClone.InformationLabel
	if plr.TeamColor ==("Really black") then
		local PlayerRank = Player:GetRoleInGroup(groupId)
		InformationLabel.Text = Player.Name .. " - " .. PlayerRank
	end)
end)