Java Script error Q's MissingReferenceExeption BCE0034 and BCE005

@taxvi I'm trying to make a gun fire a projectile with a java script i found in a video, link https://www.youtube.com/watch?v=NPlRbxJtKxE, this is the script I'm using

var projectile; Rigidbody;

var speed = 10;

function Update() {

 if (Input.GetButtonUp ("Fire1"))
 {
     clone = Instantiate(projectile, transform.position, transform.rotation);
     clone.velocity = transform.TransformDirector(Vector3(0, 0, speed));

     if (object != null) {
         Destroy(clone.gameObject, 5);
     }

}}