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

I really screwed with this error because I relaly need smooth change color , it’s a part of the game play