How come I cannot set my prefab game component into a script public variable?

Questions & Answers
1

I’m following the 2d Roguelike tutorial. In step 13 adding the sounds, I created a sound manager script in the scene. I then made it a prefab with the script and the 2 audio sources in the as a game component. I then added the SoundManager to my loader script, but I cannot drop in the prefab sound manager game component into the loader. The weird part is when I drag the prefab onto the public script variable in Loader in the Unity UI it highlights as a good link but doesn’t update when the mouse is released.

My scripts are the following.

 public class Loader : MonoBehaviour
    {
        public GameManager GameManager;

        public SoundManager SoundManager;

        static Loader()
        {
            log4net.Config.BasicConfigurator.Configure(new ConsoleAppender(new SimpleLayout()));
        }

        private void Awake()
        {
            if (GameManager.Instance == null && this.GameManager != null)
            {
                Instantiate(this.GameManager);
            }
            if (SoundManager.Instance == null && this.SoundManager != null)
            {
                Instantiate(this.SoundManager);
            }
        }

public class SoundManager :  MonoBehaviour
    {
        public static SoundManager Instance;

        public AudioSource EfxSource;

        public AudioSource MusicSource;

        public float LowPitchRange = .95f;

        public float HighPitchRange = 1.05f;

        public void PlaySingle(AudioClip clip)
        {
            this.EfxSource.clip = clip;
            this.EfxSource.Play();
        }

        public void RandomizeSfc(params AudioClip[] clips)
        {
            var randomIndex = Random.Range(0, clips.Length);
            var randomPitch = Random.Range(this.LowPitchRange, this.HighPitchRange);
            this.EfxSource.pitch = randomPitch;
            this.EfxSource.clip = clips[randomIndex];
            this.EfxSource.Pause();
        }

        private void Awake()
        {
            if (Instance == null)
            {
                Instance = this;
            }
            else if (Instance != this)
            {
                Destroy(this.gameObject);
            }
            DontDestroyOnLoad(this.gameObject);
        }
    }
2

Not sure that is the reason, but I don’t think it’s a good idea to give variables the same name as the classes they represent (or any other class for that matter).
So

public GameManager GameManager;
 
public SoundManager SoundManager;

should be:

public GameManager gameManager;
 
public SoundManager soundManager;