Headbobbing

I am trying to put a headbobbing script into a sprinting script to increase the bob amount and speed and I come across it saying headbob does not denote a valid type

Sprinting code Javascript

 #pragma strict
  
 var walkSpeed : float = 5; // Regular speed
 var sprintSpeed : float = 10; // Run speed
 var bobamounta : float = 0.1; // Walking bob amount
 var bobamountb : float = 0.2; // Headbobbing amount
 var bobbingSpeeda = 0.1;
 var bobbingSpeedb = 0.2;
 private var charMotor : CharacterMotor;
 private var charController : CharacterController;
 private var headbob : headbob;
  
 function Start () 
 {
     charMotor = GetComponent(CharacterMotor);
     charController = GetComponent(CharacterController);
     headbob = GetComponent(headbob);
 }
  
 function Update () 
 {
     //Making the actual speed var
     var speed = walkSpeed;
     
     var bobbingSpeeda = bobbingSpeedb;
     
     var bobbingAmount = bobamounta;
  
     //Checking for oppertunity to sprint
     if(charController != null)
     {
         if ( charController.isGrounded && Input.GetKey("left shift"))
         {
             //changing the speed to sprint
             speed = sprintSpeed;
             
             bobbingSpeed = bobbingSpeedb;
             
             bobbingAmount = bobamountb;
         }
     }
     else print("charController component not found.");
  
     if(charMotor != null)
         charMotor.movement.maxForwardSpeed = speed; //Setting the speed
     else print("charMotor component not found.");
 }

Headbob script javascript

  private var timer = 0.0; 
  var bobbingSpeed = 0.18; 
  var bobbingAmount = 0.2; 
  var midpoint = 2.0; 
  
  function Update () { 
     waveslice = 0.0; 
     horizontal = Input.GetAxis("Horizontal"); 
     vertical = Input.GetAxis("Vertical"); 
     if (Mathf.Abs(horizontal) == 0 && Mathf.Abs(vertical) == 0) { 
        timer = 0.0; 
     } 
     else { 
        waveslice = Mathf.Sin(timer); 
        timer = timer + bobbingSpeed; 
        if (timer > Mathf.PI * 2) { 
           timer = timer - (Mathf.PI * 2); 
        } 
     } 
     if (waveslice != 0) { 
        translateChange = waveslice * bobbingAmount; 
        totalAxes = Mathf.Abs(horizontal) + Mathf.Abs(vertical); 
        totalAxes = Mathf.Clamp (totalAxes, 0.0, 1.0); 
        translateChange = totalAxes * translateChange; 
        transform.localPosition.y = midpoint + translateChange; 
     } 
     else { 
        transform.localPosition.y = midpoint; 
     } 
  }