I can't get my sound to work!

I have been working on a minigolf game, and I want to add a sound for when the player hits the ball, but it won’t play the sound and an error keeps popping up:

PlayOneShot was called with a null AudioClip.

Here is my SoundManager script:

using UnityEngine;

public class SoundManager : MonoBehaviour
{

public static AudioClip golfSwingSound;
static AudioSource audioSrc;

void Start()
{

        golfSwingSound = Resources.Load<AudioClip> ("Swing");

        audioSrc = GetComponent<AudioSource> ();
        
}

    public static void PlaySound (string clip)
    {
        switch (clip) {

            case "Swing":
            audioSrc.PlayOneShot (golfSwingSound);
            break;
        }
    }

}

using UnityEngine;

public class PlayerMovement : MonoBehaviour
{
void Update
{
SoundManager.PlaySound (“Swing”);
}
}

My player movement doesn’t look like this, but I think this is all you need. Please let me know if you need the entire player movement script. Also sry I’m new so I don’t know how to properly space this stuff.

Well, first, to use Resources.Load, the object you are refering to must be in the “Resources” folder.
Something like this: “Assets/Resources/SoundFX/Swing.”
Then you load that object like this:

Resources.Load("SoundFX/Swing") as AudioClip;

Did you already check that?