code error in Stealth project 1

I followed the turorial, but I am getting the following errors: NullReferenceException: Object reference not set to an instance of an object PlayerMovement.Update () (at Assets/Scripts/player/PlayerMovement.cs:43)

NullReferenceException: Object reference not set to an instance of an object PlayerMovement.MovementManagement (Single horizontal, Single vertical, Boolean sneaking) (at Assets/Scripts/player/PlayerMovement.cs:52) PlayerMovement.FixedUpdate () (at Assets/Scripts/player/PlayerMovement.cs:33)

This is the script as I copied from the tutorial:

using UnityEngine; using System.Collections;

public class PlayerMovement : MonoBehaviour { public AudioClip shoutingClip; // Audio clip of the player shouting. public float turnSmoothing = 15f; // A smoothing value for turning the player. public float speedDampTime = 0.1f; // The damping for the speed parameter

 private Animator anim;              // Reference to the animator component.
 private HashIDs hash;               // Reference to the HashIDs.
 
 
 void Awake ()
 {
     // Setting up the references.
     anim = GetComponent<Animator>();
     hash = GameObject.FindGameObjectWithTag(Tags.gameController).GetComponent<HashIDs>();
     
     // Set the weight of the shouting layer to 1.
     anim.SetLayerWeight(1, 1f);
 }
 
 
 void FixedUpdate ()
 {
     // Cache the inputs.
     float h = Input.GetAxis("Horizontal");
     float v = Input.GetAxis("Vertical");
     bool sneak = Input.GetButton("Sneak");
     
     MovementManagement(h, v, sneak);
 }
 
 
 void Update ()
 {
     // Cache the attention attracting input.
     bool shout = Input.GetButtonDown("Attract");
     
     // Set the animator shouting parameter.
     anim.SetBool(hash.shoutingBool, shout);
     
     AudioManagement(shout);
 }
 
 
 void MovementManagement (float horizontal, float vertical, bool sneaking)
 {
     // Set the sneaking parameter to the sneak input.
     anim.SetBool(hash.sneakingBool, sneaking);
     
     // If there is some axis input...
     if(horizontal != 0f || vertical != 0f)
     {
         // ... set the players rotation and set the speed parameter to 5.5f.
         Rotating(horizontal, vertical);
         anim.SetFloat(hash.speedFloat, 5.5f, speedDampTime, Time.deltaTime);
     }
     else
         // Otherwise set the speed parameter to 0.
         anim.SetFloat(hash.speedFloat, 0);
 }
 
 
 void Rotating (float horizontal, float vertical)
 {
     // Create a new vector of the horizontal and vertical inputs.
     Vector3 targetDirection = new Vector3(horizontal, 0f, vertical);
     
     // Create a rotation based on this new vector assuming that up is the global y axis.
     Quaternion targetRotation = Quaternion.LookRotation(targetDirection, Vector3.up);
     
     // Create a rotation that is an increment closer to the target rotation from the player's rotation.
     Quaternion newRotation = Quaternion.Lerp(rigidbody.rotation, targetRotation, turnSmoothing * Time.deltaTime);
     
     // Change the players rotation to this new rotation.
     rigidbody.MoveRotation(newRotation);
 }
 
 
 void AudioManagement (bool shout)
 {
     // If the player is currently in the run state...
     if(anim.GetCurrentAnimatorStateInfo(0).nameHash == hash.locomotionState)
     {
         // ... and if the footsteps are not playing...
         if(!audio.isPlaying)
             // ... play them.
             audio.Play();
     }
     else
         // Otherwise stop the footsteps.
         audio.Stop();
     
     // If the shout input has been pressed...
     if(shout)
         // ... play the shouting clip where we are.
         AudioSource.PlayClipAtPoint(shoutingClip, transform.position);
 }

}

Everything is declared, but still getting the errors