How to use a list to populate a target object?

The intended behavior is that the GroundRoom object should pass a list of objects of interest to the director script. The director script then instructs the controller script to move the gameobject to the target (in this case the first object in the list).

However, I keep getting null reference exceptions. Is this because the object is never properly added to the list? How do I fix this?

Thank you in advance for your help. (Edit: updated code and included runtime errors below.)

ObjectOfInterest.cs

 using UnityEngine;
 using System.Collections.Generic;
 
 public class ObjectOfInterest : MonoBehaviour {
     
     public string objectName;
     private Room room;
     
     // Use this for initialization
     void Start () {
     room = gameObject.GetComponent<Room>();
     room.objectsInRoom.Add(gameObject);
     }
     
     // Update is called once per frame
     void Update () {
     
     }
 }
 

Room.cs

 using UnityEngine;
 using System.Collections.Generic;
 
 public class Room : MonoBehaviour {
     
     public List<GameObject> objectsInRoom = new List<GameObject>();
     
     // Use this for initialization
     void Start () {
 
     }
     
     // Update is called once per frame
     void Update () {
     
     }
 }
 

Director.cs

 using UnityEngine;
 using System.Collections;
 
 public class Director : MonoBehaviour {
     
     private GameObject target;
     private Controller controller;
     private GameObject roomObject;
     private Room roomScript;
     
     // Use this for initialization
     void Start () {
     controller = gameObject.GetComponent<Controller>();
     roomObject = GameObject.Find ("GroundRoom");
     roomScript = roomObject.GetComponent<Room>();
     }
     
     // Update is called once per frame
     void Update () {
     target = roomScript.objectsInRoom[0];    
     }
     
     public GameObject Target () {
         return target;
     }
     
     
 }

Controller.cs

 using System.Collections;
 
 public class Controller : MonoBehaviour {
     
     private Director director;
     public float speed;
     public float rotationSpeed;
     Vector3 direction = new Vector3();
     Vector3 targetLocation = new Vector3();
     Quaternion looking = new Quaternion();
     public enum state {moving, idle};
     public static state MyState;
     private GameObject target;
         
     // Use this for initialization
     void Start () {
     director = gameObject.GetComponent<Director>();
     //set default speed and rotationSpeed;
     if (speed == 0) {
         speed = 100;
         }
     if (rotationSpeed == 0) {
         rotationSpeed = 100;
         }
     }
     
     // Update is called once per frame
     void Update () {
         target = director.Target();
         MoveTo ();
         RotateTo ();
     }
     
     void MoveTo () {
         targetLocation = target.transform.position;
         targetLocation.y = transform.position.y;
         transform.position = Vector3.MoveTowards(transform.position, targetLocation, speed * Time.deltaTime);
     }
     
     void RotateTo () {
         targetLocation = target.transform.position;
         direction = (targetLocation - transform.position).normalized;
         looking = Quaternion.LookRotation(direction);
         looking.x = 0;
         looking.z = 0;
         transform.rotation = Quaternion.Slerp(transform.rotation, looking, Time.deltaTime * rotationSpeed);
     }
 }

 
 

The Exceptions at runtime are:

Not getting ArgumentOutOfRangeException ever since I initialized the list.

NullReferenceException at targetLocation = target.transform.position; in the Controller script, MoveTo() function, line 36.

 objectsInRoom = new List<GameObject>();