Unity 4 animation.Play problem!plz help

hey im new at scripting and i watch a tut series! The tut series is from unity 3.5.6 and i have unity 4.0 and i discoverd a problem with scripting i made some other script withis function(animation.Play) but none of them seems to work.I don know how can I do this script working so plz help me!!

Here is the script:

using UnityEngine; using System.Collections; using System.Collections.Generic;

public class PlayerController : MonoBehaviour { public CharacterController CharCont; public CharacterMotor CharMotor;

 //Holders fo Weapons
 public Transform WalkAnimationHolder;
 public Transform JumpAnimationHolder;
 public Transform SwayHolder;
 public Transform RecoilHolder;
 public Transform RecoilHolderCamera;
 
 public WalkingState walkingstate = WalkingState.Idle;
 
 public float VelocityMagnitude;
 
 public float WalkSpeed;
 public float RunSpeed;
 
 public bool WasStanding;
 
 public WeaponInfo CurrentWeapon;
 public List WeaponList = new List();
 
 public Vector3 CurrentRecoil1;
 public Vector3 CurrentRecoil2;
 public Vector3 CurrentRecoil3;
 public Vector3 CurrentRecoil4;
 
 private float shoottime = 0;
 
 void Start()
 {
     CurrentWeapon = WeaponList[0];
 }
 
 public void Update()
 {
     ShootController();
 }
 
 public void FixedUpdate()
 {
     AnimationController();
     SwayController();
     SpeedController();
     RecoilController();
     VelocityMagnitude = CharCont.velocity.magnitude;
 }
 
 public void SpeedController()
 {
     if((Input.GetAxis ("Horizontal")!=0 || Input.GetAxis ("Vertical")!=0) &&   VelocityMagnitude>0)
     {
         if(Input.GetButton("Run"))
         {
             walkingstate = WalkingState.Running;
             CharMotor.movement.maxForwardSpeed = RunSpeed;
             CharMotor.movement.maxSidewaysSpeed = RunSpeed;
             CharMotor.movement.maxBackwardsSpeed = RunSpeed / 2;
         }
         else
         {
             walkingstate = WalkingState.Walking;
             CharMotor.movement.maxForwardSpeed = WalkSpeed;
             CharMotor.movement.maxSidewaysSpeed = WalkSpeed;
             CharMotor.movement.maxBackwardsSpeed = WalkSpeed / 2;
         }
     }
     else
     {
         walkingstate = WalkingState.Idle;
     }
 }
 
 public void AnimationController()
 {
     
     if(WasStanding && !CharCont.isGrounded)
     {
         WasStanding = false;
         JumpAnimationHolder.animation.Play("TestJump");
     }
     else if(!WasStanding && CharCont.isGrounded)
     {
         WasStanding = true;
         JumpAnimationHolder.animation.Play("TestLand");
     }
     
     
     
     if( walkingstate == WalkingState.Running)
     {
         WalkAnimationHolder.animation["M4_Running"].speed = VelocityMagnitude / RunSpeed * 1.2f;
         WalkAnimationHolder.animation.CrossFade("M4_Running", 0.2f);
     }
     else if( walkingstate == WalkingState.Walking)
     {
         WalkAnimationHolder.animation["M4_Running"].speed = VelocityMagnitude / WalkSpeed * 1.2f;
         WalkAnimationHolder.animation.CrossFade("M4_Walking", 0.2f);
     }
     else
     {
         WalkAnimationHolder.animation.CrossFade("M4_Idle", 0.2f);
     }
         
 }
 
 public void SwayController()
 {
     
 }
 
 public void ShootController()
 {
     if(Input.GetButton("Fire1"))
     {
         if (shoottime <= Time.time)
         {
             shoottime = Time.time + CurrentWeapon.firerate;
             CurrentRecoil1 += new  Vector3(CurrentWeapon.RecoilRotation.x, Random.Range (- CurrentWeapon.RecoilRotation.y,CurrentWeapon.RecoilRotation.y));
             CurrentRecoil3 += new Vector3(Random.Range (- CurrentWeapon.RecoilKickback.x,CurrentWeapon.RecoilKickback.x),Random.Range (-       CurrentWeapon.RecoilKickback.y,CurrentWeapon.RecoilKickback.y),CurrentWeapon.RecoilKickback  .z);
         }
     }
 }
 
 public void RecoilController()
 {
     CurrentRecoil1 = Vector3.Lerp(CurrentRecoil1 ,Vector3.zero ,0.1f);
     CurrentRecoil2 = Vector3.Lerp(CurrentRecoil2 ,CurrentRecoil1 ,0.2f);
     CurrentRecoil3 = Vector3.Lerp(CurrentRecoil3 ,Vector3.zero ,0.1f);
     CurrentRecoil4 = Vector3.Lerp(CurrentRecoil4 ,CurrentRecoil2 ,0.2f);
     
     RecoilHolder.localEulerAngles = CurrentRecoil2;
     RecoilHolder.localPosition = CurrentRecoil4;
     
     RecoilHolderCamera.localEulerAngles = CurrentRecoil2 / 1.3f;
 }

}

public enum WalkingState { Idle, Walking, Running }

[System.Serializable] public class WeaponInfo { public string name = "Weapon"; public float firerate = 0.1f;

 public Transform WeaponTransform;
 
 public Vector3 RecoilRotation;
 public Vector3 RecoilKickback;

}

plz plz plz plz someone plz help me