Compass Tracker in Teams

So I have two Problems.
1. My Code isn't working! (lol idk y)
2. I have to add something

So at the end of this Thread you can see the code dont worry.
To my first problem; I dont know, if I am entering ("/track") it should track if i have 15 levels , than they should remove it. The Tracker should show the nearest Player in the map (online Player*)

To the second: I want to make Teams of 2 (I dont have any arraylist yet) and i d be able to add every single player to a arraylist with his team partner , but i just want that I can't track my team member (But because other players are in other teams i just can't choose one player who won't get tracked)
:S I dont know how is should do it

SRY FOR MY BAD ENGLISH
EDIT = The "if target = null" thing should check if there isn't a player online to track / a player who isnt in your team is offline)

Here the code (Ignore the Strings

Code:

  
    @Override
    public boolean onCommand(CommandSender cs, Command cmd, String label,String[] args) {
        if(!(cs instanceof Player)) {
            cs.sendMessage(mcrotxt + "Du kannst diesen Befehl nur als Spieler aussenden!");
          
        }
        Player p = (Player)cs;
      
        //Track
        Player target = getNearestPlayer(p);
        if(target == null) {
            p.sendMessage(ChatColor.GRAY + "[" + ChatColor.RED + "Mcro" + ChatColor.GRAY + "] Kein Spieler kann getracked werden!");
        }
      
  
        if(p.getLevel() < 15){
                p.sendMessage(ChatColor.GRAY + "[" + ChatColor.RED + "Mcro" + ChatColor.GRAY + "] Du hast nicht genügend XP!");
                    }
      
        p.sendMessage(mcrotxt + "Dein Kompass zeigt auf " + ChatColor.RED + getNearestPlayer(p).getName());
        p.setLevel(-15);
        p.sendMessage(mcrotxt + "Du hast dabei 15 Level verloren!");
        p.sendMessage(mcrotxt + getNearestPlayer(p).getName() + "'s Koordinaten sind: ");
        p.sendMessage(X + getNearestPlayer(p).getLocation().getBlockX() + " " + Y + getNearestPlayer(p).getLocation().getBlockY() + " " + Z + getNearestPlayer(p).getLocation().getBlockZ());
        p.setCompassTarget(getNearestPlayer(p).getLocation());
      
      
        return true;
    }
  
    public Player getNearestPlayer(Player p ) {
      
        double distance = Double.MAX_VALUE;
        Player target = null;  
      
        for(Entity entity : p.getNearbyEntities(8000,8000,8000)) {
            if(entity instanceof Player) {
              
                double dis = p.getLocation().distance(entity.getLocation());
              
                if(dis < distance) {
                    distance = dis;
                    target = (Player) entity;
                }
              
            }
          
        }
        return target;
    }