general problem on Lerp fonction for smoothcolor changing

Hi,

I got a problem with the game i'm trying to develop. I move a ball like an Agar.io The ball should be switching color (smoothly) then it Moving or not But it doesn't work.

The moving script:

public class Move : MonoBehaviour {

 public float Speed;
 public bool inMove = false;
 private void Start()
 {
     Vector3 target = Camera.main.ScreenToWorldPoint(Input.mousePosition);
     target.x = transform.position.x;
     target.y = transform.position.y;
 }

 // Update is called once per frame
 void Update () {


     Vector3 target = Camera.main.ScreenToWorldPoint(Input.mousePosition);
     target.z = transform.position.z;
     
     if ((target.x != transform.position.x) | (target.y != transform.position.y))
     {
         inMove = true;
         //target.x = transform.position.x;
         //target.y = transform.position.y;

     }
     else
     {
         inMove = false;
     }

     transform.position = Vector3.MoveTowards(transform.position, target, Speed * Time.deltaTime);
 }

}

the changing color script :

public class ColorSpeed : MonoBehaviour {

 public List<Material> Mats = new List<Material>();
 private float value1;
 private float value2;
 private float value3;
 public Move _move;


 public float timeLeft;


 private void Update()
 {
     GetComponent<Renderer>().material = Mats[0];
     if (_move.inMove == false)
     {
         
         // Assign target color
         GetComponent<Renderer>().material = Mats[1];
         //change smoothly the color
         GetComponent<Renderer>().material.color = Color.Lerp(GetComponent<Renderer>().material.color, Mats[0].color, Time.deltaTime / 2);
         
     }
     else
     {
         GetComponent<Renderer>().material = Mats[0];
         GetComponent<Renderer>().material.color = Color.Lerp(GetComponent<Renderer>().material.color,Mats[1].color, Time.deltaTime / 2);
         // Update timer
         
     }
 }

the move animation is working, the condition with bool too , but what it's not working is Lerp . I tryied many code on internet just for test this fonction and I always had the same issue

: CS0121 C# The call is ambiguous between the following methods or properties: and

thank you in advance