Layermask exception

I have this Radar code part from a project i downloaded from here:

Radar Project Link

By it self it's working fine. I'm taking the Test scene from the project to my Hierarchy and it's working fine. What it does is when i move my self around walking around when i'm getting close to cubes there are 5 cubes the cubes in the radar are in red points like enemies.

But i want to make something else now. In my own scene i did i have 5 cubes i added the Radar script to one of the cubes this cube rotate none stop by script i did. So now the radar is on the cube and rotating. What i want to do is when i'm getting close to the cube(radar) it will show on the radar me my self in red point like enemy moving close to the radar !

The first screenshot show it how it looks like with the porject i downloaded:

You can see on the right the game window the cubes and i'm from first person view moving close to the cubes they are in red points in the radar.

On the this screenshot now it's my scene you can see the cube the one in the middle is the one that rotate and the radar script is attached to it. There is a big red ball rotating with the cube part of the radar this ball in front of me is the border of the radar radius when it rotate.

The red ball behind not sure what it is.

Now i want to do when i move close to the rotating cube show me the character( ThirdPersonController ) in red point in the radar on the top right corner the green radar. Like now i'm the enemy ! Now the radar is static on the cube and when i will get close to it it will show in the radar( Radar Camera ) that i'm the enemy. Not like before the cubes.

This is the exceptions i'm getting two exceptions same exceptions errors on two lines:

A game object can only be in one layer. The layer needs to be in the range [0...31] UnityEngine.GameObject:set_layer(Int32) Radar:Update() (at Assets/Radar/Radar.cs:26)

And

A game object can only be in one layer. The layer needs to be in the range [0...31] UnityEngine.GameObject:set_layer(Int32) Radar:Update() (at Assets/Radar/Radar.cs:27)

This is the two lines 26 and 27:

 borderObjects[i].layer = LayerMask.NameToLayer("Radar");
 radarObjects[i].layer = LayerMask.NameToLayer("Invisible");

Not sure if this exceptions is the only thing that make my idea not to work.

This is the full Radar script :

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
 public class Radar : MonoBehaviour {
 
     public GameObject[] trackedObjects;
     List<GameObject> radarObjects;
     public GameObject radarPrefab;
     List<GameObject> borderObjects;
     public float switchDistance;
     public Transform helpTransform;
 
     // Use this for initialization
     void Start () {
         createRadarObjects();
     }
     
     // Update is called once per frame
     void Update () {
         for(int i = 0; i < radarObjects.Count; i++) {
             if(Vector3.Distance(radarObjects[i].transform.position, transform.position) > switchDistance) {
                 //switch to borderObjects
                 helpTransform.LookAt(radarObjects[i].transform);
                 borderObjects[i].transform.position = transform.position + switchDistance*helpTransform.forward;
                 borderObjects[i].layer = LayerMask.NameToLayer("Radar");
                 radarObjects[i].layer = LayerMask.NameToLayer("Invisible");
             } else {
                 //switch back to radarObjects
                 borderObjects[i].layer = LayerMask.NameToLayer("Invisible");
                 radarObjects[i].layer = LayerMask.NameToLayer("Radar");
             }
         }
     }
 
     void createRadarObjects() {
         radarObjects = new List<GameObject>();
         borderObjects = new List<GameObject>();
         foreach(GameObject o in trackedObjects) {
             GameObject k = Instantiate(radarPrefab, o.transform.position, Quaternion.identity) as GameObject;
             radarObjects.Add(k);
             GameObject j = Instantiate(radarPrefab, o.transform.position, Quaternion.identity) as GameObject;
             borderObjects.Add(j);
         }
     }
 }