Player walking Script

Hey guys! Some of you might now the ETeeski tutorials, some of you might not. Either way, this is a script from one of his tutorials and I have one small issue: The player wont move from the spot (or jump). I copied the script from his tutorials, which didn't work out for me, and then copy pasted his reference script, still no difference. Can anybody figure out what I might be doing wrong? Here's the script I have for reference. Thank you in advance!

 var walkAcceleration : float = 5;
 
 var walkAccelAirRacio : float = 0.1;
 
 var walkDeacceleration : float = 5;
 
 @HideInInspector
 
 var walkDeaccelerationVolx : float;
 
 @HideInInspector
 
 var walkDeaccelerationVolz : float;
 
  
 
 var cameraObject : GameObject;
 
 var maxWalkSpeed : float = 20;
 
 @HideInInspector
 
 var horizontalMovement : Vector2;
 
  
 
 var jumpVelocity : float = 20;
 
 
 var grounded : boolean = false;
 
 var maxSlope : float = 60;
 
  
 
 function LateUpdate () 
 
 {
 
     horizontalMovement = Vector2(rigidbody.velocity.x, rigidbody.velocity.z);
 
     if (horizontalMovement.magnitude > maxWalkSpeed)
 
     {
 
         horizontalMovement = horizontalMovement.normalized;
 
         horizontalMovement *= maxWalkSpeed;     
 
     }
 
     rigidbody.velocity.x = horizontalMovement.x;
 
     rigidbody.velocity.z = horizontalMovement.y;
 
     
 
     if (grounded)
         {
         //Get the Player to slowly gain speed
         rigidbody.velocity.x = Mathf.SmoothDamp(rigidbody.velocity.x, 0, walkDeaccelerationVolx, walkDeacceleration);
 
         rigidbody.velocity.z = Mathf.SmoothDamp(rigidbody.velocity.z, 0, walkDeaccelerationVolz, walkDeacceleration);
         }
 
     
     //Player faces the direction of the Camera
     transform.rotation = Quaternion.Euler(0, cameraObject.GetComponent(MouseLookScript).currentYRotation, 0);
 
     
 
     if (grounded)
         //Player moves in directions in case the user presses "wasd" buttons if player is grounded
         rigidbody.AddRelativeForce(Input.GetAxis("Horizontal") * walkAcceleration * Time.deltaTime, 0, Input.GetAxis("Vertical") * walkAcceleration * Time.deltaTime);
 
     else
         //If the player isnt grounded use the vars for his air control
         rigidbody.AddRelativeForce(Input.GetAxis("Horizontal") * walkAcceleration * walkAccelAirRacio * Time.deltaTime, 0, Input.GetAxis("Vertical") * walkAcceleration * walkAccelAirRacio * Time.deltaTime);
 
             
 
     if (Input.GetButtonDown("Jump") && grounded)
         //If player jumps, add force to the rigid body
         rigidbody.AddForce(0,jumpVelocity,0);
 
 }
 
  
 
 function OnCollisionStay (collision : Collision)
 
 {
 
     for (var contact : ContactPoint in collision.contacts)
 
     {
 
         if (Vector3.Angle(contact.normal, Vector3.up) < maxSlope)
 
             grounded = true;
 
     }
 
 }
 
  
 
 function OnCollisionExit ()
 
 {
 
     grounded = false;
 
 }