BCE0077: It is not possible to invoke an expression of type 'UnityEngine.Animation'. Please help.

I am making a FPS game and I am OK at scripting. I am getting that error twice, one at line 46, and one at 55. What I am trying to do is to make it so my animations play as fast as I am running so my gun is not slow but I am running really fast. Here is my script.

 var PlayerState : float;
 var PlayerAnimSec : GameObject;
 var PlayerMotor : CharacterMotor;
 var WalkingSpeed : float = 6;
 var SprintingSpeed : float = 8;
 var PlayerBossControll : CharacterController;
 var CharacterMag;
 
 function Update () 
 {
     PlayerStateController();
     PlayerAnims();
     CharacterMag = PlayerBossControll.velocity.magnitude;
 }
 
 
 function PlayerStateController()
 {
     if(Input.GetAxis("Vertical") !=0 || Input.GetAxis("Horizontal") !=0)
     {
         if(Input.GetKey("left shift"))
         {
             PlayerState = 2;    
         }
         else
         {
             PlayerState = 1;    
         }
         
     }    
     else
     {
         PlayerState = 0;
     }    
 }
 
 function PlayerAnims()
 {
     if(PlayerState == 0)
     {
         PlayerAnimSec.animation.CrossFade("Idle Animation", 0.4);
     }    
     
     else if(PlayerState == 1)
     {    
         PlayerAnimSec.animation("Walk Animation").speed = CharacterMag / WalkingSpeed;
         PlayerAnimSec.animation.CrossFade("Walk Animation", 0.4);
         PlayerMotor.movement.maxForwardSpeed =     WalkingSpeed;        
         PlayerMotor.movement.maxBackwardsSpeed = WalkingSpeed / 2;    
         PlayerMotor.movement.maxSidewaysSpeed = WalkingSpeed;        
 
         }
     else if(PlayerState == 2)
     {    
         PlayerAnimSec.animation("Sprint Animation").speed = CharacterMag / SprintingSpeed;        
         PlayerAnimSec.animation.CrossFade("Sprint Animation", 0.4);
         PlayerMotor.movement.maxForwardSpeed =     SprintingSpeed;        
         PlayerMotor.movement.maxBackwardsSpeed = SprintingSpeed / 2;    
         PlayerMotor.movement.maxSidewaysSpeed = SprintingSpeed;        
         }

Please help. I can't find the answer anywhere....