Survival Shooter LineRenderer.setPosition index out of bounds

I am following the survival shooter tutorial, and am having issues. I would like to have all errors corrected, but it really isn't impacting gameplay that much. I added a second element under "Materials", but that hasn't changed anything. I know my approach to solving these issues probably needs to change, but this is all very new to me, so could I get some help with this issue? Here is the code

using UnityEngine;

public class PlayerShooting : MonoBehaviour { public int damagePerShot = 20; public float timeBetweenBullets = 0.15f; public float range = 100f;

 float timer;
 Ray shootRay = new Ray();
 RaycastHit shootHit;
 int shootableMask;
 ParticleSystem gunParticles;
 LineRenderer gunLine;
 AudioSource gunAudio;
 Light gunLight;
 float effectsDisplayTime = 0.2f;


 void Awake ()
 {
     shootableMask = LayerMask.GetMask ("Shootable");
     gunParticles = GetComponentInChildren<ParticleSystem> ();
     gunLine = GetComponentInChildren <LineRenderer> ();
     gunAudio = GetComponentInChildren<AudioSource> ();
     gunLight = GetComponentInChildren<Light> ();
 }


 void Update ()
 {
     timer += Time.deltaTime;

     if(Input.GetButton ("Fire1") && timer >= timeBetweenBullets && Time.timeScale != 0)
     {
         Shoot ();
     }

     if(timer >= timeBetweenBullets * effectsDisplayTime)
     {
         DisableEffects ();
     }
 }


 public void DisableEffects ()
 {
     gunLine.enabled = false;
     gunLight.enabled = false;
 }


 void Shoot ()
 {
     timer = 0f;

     gunAudio.Play ();

     gunLight.enabled = true;

     gunParticles.Stop ();
     gunParticles.Play ();

     gunLine.enabled = true;
     gunLine.SetPosition (0, transform.position);

     shootRay.origin = transform.position;
     shootRay.direction = transform.forward;

     if(Physics.Raycast (shootRay, out shootHit, range, shootableMask))
     {
         EnemyHealth enemyHealth = shootHit.collider.GetComponent <EnemyHealth> ();
         if(enemyHealth != null)
         {
             enemyHealth.TakeDamage (damagePerShot, shootHit.point);
         }
         gunLine.SetPosition (1, shootHit.point);
     }
     else
     {
         gunLine.SetPosition (1, shootRay.origin + shootRay.direction * range);
     }
 }

}