Object reference not set to an instance of an object

Hello everyone, im having a problem when trying to connect 2 scripts, the problem is: "NullReferenceException:Object reference not set to an instance of an object"(its says the problem is in the 8 line of the CollisionDetectorSphereScript)Here i leave the 2 connected scripts:

CollisionDetectorSphereScript:

 var floatAbove : float = 0.1;
 
 var playerCapsuleTransform : Transform;
 
 @HideInInspector
 
 var collisionDetected : boolean = false;

      
 function Update ()
 {
     transform.position.x = playerCapsuleTransform.position.x;
     transform.position.z = playerCapsuleTransform.position.z;
     transform.position.y = playerCapsuleTransform.position.y + ((playerCapsuleTransform.GetComponent(Collider).height * playerCapsuleTransform.localScale.y) / 2) + (transform.localScale.y / 2) + floatAbove;
 }
      
 function OnCollisionStay (collision : Collision)
 {
     if (collision.transform.tag == "Level Parts")
     collisionDetected = true;
 }
      
 function OnCollisionExit ()
 {
     collisionDetected = false;
 }

And the other, PlayerMovementScript:

 var walkAcceleration : float = 5;
 var walkAccelAirRadio : float = 0.1;
 var walkDeacceleration : float = 5;
 @HideInInspector
 var walkDeaccelerationVolx : float;
 @HideInInspector
 var walkDeaccelerationVolz : float;
 
 var cameraObject : GameObject;
 var maxWalkSpeed : float = 15;
 @HideInInspector
 var horizontalMovement : Vector2;
 
 var jumpVelocity : float = 20;
 @HideInInspector
 var grounded : boolean = false;
 var maxSlope : float = 60;
 
 var crouchRacio : float = 0.3;
 var transitionToCrouchSec : float = 0.2;
 var crouchingVelocity : float;
 var currentCrouchRacio : float = 1;
 var originalLocalScaleY : float;
 var crouchLocalScaleY : float;
 var collisionDetectionSphere : GameObject;
  
 function Awake ()
 {
     currentCrouchRacio = 1;
     originalLocalScaleY = transform.localScale.y;
     crouchLocalScaleY = transform.localScale.y * crouchRacio;    
 }
 
 function Update () 
 {
     transform.localScale.y = Mathf.Lerp(crouchLocalScaleY, originalLocalScaleY, currentCrouchRacio);
     if (Input.GetButton("Crouch"))
         currentCrouchRacio = Mathf.SmoothDamp(currentCrouchRacio, 0, crouchingVelocity, transitionToCrouchSec);
     if (Input.GetButton("Crouch") == false && collisionDetectionSphere.GetComponent(CollsionDetectionSphereScript).collisionDetected == false)
         currentCrouchRacio = Mathf.SmoothDamp(currentCrouchRacio, 1, crouchingVelocity, transitionToCrouchSec);    
     
     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){
         rigidbody.velocity.x = Mathf.SmoothDamp( rigidbody.velocity.x, 0, walkDeaccelerationVolx, walkDeacceleration);
         rigidbody.velocity.z = Mathf.SmoothDamp( rigidbody.velocity.z, 0, walkDeaccelerationVolz, walkDeacceleration);}
         
     transform.rotation = Quaternion.Euler(0, cameraObject.GetComponent(MouseLookScript).currentYRotation,0);
     
     if (grounded)
         rigidbody.AddRelativeForce(Input.GetAxis("Horizontal") * walkAcceleration * Time.deltaTime , 0, Input.GetAxis("Vertical") * walkAcceleration  * Time.deltaTime);
     else    
         rigidbody.AddRelativeForce(Input.GetAxis("Horizontal") * walkAcceleration * walkAccelAirRadio * Time.deltaTime , 0, Input.GetAxis("Vertical") * walkAcceleration * walkAccelAirRadio * Time.deltaTime);
     
     if (Input.GetButtonDown("Jump")&& grounded)
         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;
 }

Thanks to ETeeskiTutorials and who reads this question :)

PD: sorry for my bad english