The variable has not been assigned

using UnityEngine;
using System.Collections;

public class PlayerController : MonoBehaviour {

	float speed = 10f;
	bool facingRight = true;

	Animator anim;
	public GameObject playerBullet;

	void Start () 
	{
		anim = GetComponent<Animator> ();
	}

	void Update () 
	{
		//Player Movement system
		float moveHor = Input.GetAxisRaw ("Horizontal");
		transform.Translate (moveHor * speed * Time.deltaTime, 0, 0);
		anim.SetFloat ("SpeedHor", Mathf.Abs (moveHor));

		float moveVert = Input.GetAxisRaw ("Vertical");
		transform.Translate (0, moveVert * speed * Time.deltaTime, 0);
		anim.SetFloat ("SpeedVert", moveVert);

		if (moveHor > 0 && !facingRight)
				FlipHor ();
			else if (moveHor < 0 && facingRight)
				FlipHor ();

		//Player attacking system - Instantiate a prefab bullet and project it 
		//in the direction the player is facing x number of units forward.
		if (Input.GetKeyDown ("space"))
				Instantiate (playerBullet, transform.position, transform.rotation);
	}

	void FlipHor()
	{
		facingRight = !facingRight;
		Vector3 theScale = transform.localScale;
		theScale.x *= -1;
		transform.localScale = theScale;
	}
}

I’m getting the error

UnassignedReferenceException: The variable playerBullet of PlayerController has not been assigned.
You probably need to assign the playerBullet variable of the PlayerController script in the inspector.
UnityEngine.Object.Internal_InstantiateSingle (UnityEngine.Object data, Vector3 pos, Quaternion rot) (at C:/BuildAgent/work/d63dfc6385190b60/artifacts/EditorGenerated/UnityEngineObject.cs:74)
UnityEngine.Object.Instantiate (UnityEngine.Object original, Vector3 position, Quaternion rotation) (at C:/BuildAgent/work/d63dfc6385190b60/artifacts/EditorGenerated/UnityEngineObject.cs:84)

But I have assigned the variable in the inspector. This leads me to believe that my code is incorrect, but I don’t see how that is the case. I’m totally lost on this one. Just trying to instantiate a bullet prefab but this is holding me up. Anyone that can explain the issue here?

Nevermind, I found the answer:

Although I had added the prefab to the variable on the script, I didn’t add it to the script on the transform using said script. :confused: dumb oversight.