Animations won't play on command

So I have a script that calls certain animations when events occur. Like if the button for sprinting is pressed, then play the sprint animation. But only a few work, like the walk animation, the idle animation, and the shoot animation. Any ideas as to why these won't play when told to?

 var WalkAnim : String = "Walk";
 var IdleAnim : String = "Idle";
 var FireAnim : String = "Firing";
 var AimAnim : String = "AimIdle";
 var RunAnim : String = "Run";
 var ReloadAnim : String = "Reload";
 var PlayWhileAiming = false;
 var WalkSpeedModifier : float = 8;
 var WalkSpeedMultiplier : float = 2;
 var Fire : GameObject;
 var Reloading : boolean;
 private var DefaultPos : Vector3;
 private var Controller : CharacterController;
 
 function Start () {
 
     DefaultPos = transform.localPosition;
     Controller = GameObject.FindGameObjectWithTag("Player").GetComponent(CharacterController);
 
 }
 
 function Update () {
 
     if(Input.GetAxis("Vertical")||Input.GetAxis("Horizontal")){
     gameObject.animation.CrossFade(WalkAnim,0.4);
     gameObject.animation[WalkAnim].speed = Controller.velocity.magnitude / WalkSpeedModifier * WalkSpeedMultiplier;
     }
     
     else 
     {
         transform.localPosition = Vector3.Lerp(transform.localPosition,DefaultPos,0.4);
         gameObject.animation.CrossFade(IdleAnim);
     }
     
     if(Input.GetButton("Fire1") && PlayWhileAiming == false && Fire.GetComponent(FireScript2).CanFire == true){
 
     transform.localPosition = Vector3.Lerp(transform.localPosition,DefaultPos,5);
     gameObject.animation.Play(FireAnim);
     
     if(Input.GetButton("Fire2") || Input.GetKey("e") && PlayWhileAiming == false){
 
     transform.localPosition = Vector3.Lerp(transform.localPosition,DefaultPos,5);
     gameObject.animation.Stop(WalkAnim);
     
     if(Input.GetKey("q") || Input.GetKey("left shift") && PlayWhileAiming == false){
 
     transform.localPosition = Vector3.Lerp(transform.localPosition,DefaultPos,5);
     gameObject.animation.CrossFade(RunAnim);
     
     
     Reloading = false;
     
     if(Input.GetButton("Reload")) {
     Reloading = true;
     }
     
     if(Reloading == true){
 
     transform.localPosition = Vector3.Lerp(transform.localPosition,DefaultPos,5);
     gameObject.animation.CrossFade(ReloadAnim);
     
                 }
             }
     
         }
 
     }
 
 }