Why won't my script load?

Hi,

I am trying to make a FPS game, and so far I have my player moving around and shooting. I am trying to make it so that when the bullets hit something, they destroy themselves.

This is the code i am using to create the bullets:

 using UnityEngine;
 using System.Collections;
 
 public class FP_Shooting : MonoBehaviour {
 
     public GameObject Bullet_prefab;
     float bulletImpulse = 50f;
     // Use this for initialization
     void Start () {
     
     }
     
     // Update is called once per frame
     void Update () {
 
         if (Input.GetButtonDown ("Fire1")) {
             
             Camera cam = Camera.main;
             GameObject thebullet = (GameObject)Instantiate(Bullet_prefab, cam.transform.position + cam.transform.forward, cam.transform.rotation);
             thebullet.GetComponent<Rigidbody>().AddForce(cam.transform.forward * bulletImpulse, ForceMode.Impulse);
             Debug.Log ("Click");
 
         }
     }
 }
 

And this is the code I am using to destroy them on contact:

 using UnityEngine;
 using System.Collections;
 
 public class NewBehaviourScript : MonoBehaviour {
 
 
     // Use this for initialization
     void Start () {
 
 
     }
     
     // Update is called once per frame
     void Update () {
     
     }
 
     void OnCollisionEnter() {
         Destroy (gameObject);
     }
 }
 

In the Inspector, under my Bullet_Destroy script, it says "The associated script can not be loaded. Please fix any compile errors and assign a valid script". I have no idea why it is saying this, ans I can't see any errors in the script.

Any help would be greatly appreciated! :)