Multiple Animations for the Same GameObject

I am writing my own, more advanced FPS controller and I have come across a problem with animating. I try to create multiple animations in my FPS Controller GameObject but it says, "Can't add the same object multiple times!". This is really frustrating me because I want to have both a running and a walking animation. Heres my FPS code so far, var rigidBody : Rigidbody; var fpsController : Transform; var fpsGameObject : GameObject;

 var fpsCamera : Transform; 
 var bobHeadRunningAnimation : Animation;
 var bobHeadWalkingAnimation : Animation;
 
 var jumpVelocity : float;
 
 var forwardWalkVel : float; 
 var sideWalkVel : float;
 var backWalkVel : float;
 var runVel : float;

 private var isCrouching : boolean = false;
 private var beforeCrouchHeight : float = 0;

 function Update () {
     if (Input.GetKeyDown(KeyCode.Space))
         prepareJump();

     if (Input.GetKeyUp(KeyCode.Space))
         jump();

     if (Input.GetKey(KeyCode.W)) {
         fpsController.Translate(Vector3.forward * forwardWalkVel * Time.deltaTime);
         bobHead(false);
     }

     if (Input.GetKey(KeyCode.A)) {
         fpsController.Translate(Vector3.left * sideWalkVel * Time.deltaTime);
         bobHead(false);
     }

     if (Input.GetKey(KeyCode.S)) {
         fpsController.Translate(Vector3.back * backWalkVel * Time.deltaTime);
         bobHead(false);
     }

     if (Input.GetKey(KeyCode.D)) {
         fpsController.Translate(Vector3.right * sideWalkVel * Time.deltaTime);
         bobHead(false);
     }

     if (Input.GetKeyDown(KeyCode.C)) {
         if (isCrouching == false) {
             beforeCrouchHeight = fpsController.position.y; //Save Before Crouch Height
             fpsGameObject.transform.localScale = new Vector3(1, 0.52, 1); //0.5 wouldn't work!
             isCrouching = true;
         }
         else if (isCrouching == true) {
             fpsGameObject.transform.localScale = new Vector3(1, 1, 1);
             fpsController.position.y = beforeCrouchHeight; //Reset Height
             beforeCrouchHeight = 0; //Reset Value
             isCrouching = false;
         }
     }

     if (Input.GetKey(KeyCode.LeftShift)) {
         fpsController.Translate(Vector3.forward * runVel * Time.deltaTime);
         bobHead(true);
         if (Input.GetKeyUp(KeyCode.LeftShift))
             bobHeadRunningAnimation.Stop();
     }
 }

 function prepareJump() {
     fpsCamera.Translate(Vector3.down * 0.1);
     forwardWalkVel /= 2;
     sideWalkVel /= 2;
     backWalkVel /= 2;
 }

 function jump() {
     fpsCamera.Translate(Vector3.up * 0.1);
     rigidBody.AddRelativeForce(0, jumpVelocity, 0);
     forwardWalkVel *= 2;
     sideWalkVel *= 2;
     backWalkVel *= 2;
 }

 function bobHead(isRunning : boolean) {
     if (isRunning == true)
         bobHeadRunningAnimation.Play();
     else
             //Cannot do anything until I have another animation
 }

Here is the screen shot of my inspector:

Here is a screenshot of the error: