Ошибка при использование DoTWeen в Unity

У меня есть скрипт который делает анимации окна и его элементов с помощью DoTween. Но в консоле не понятная мне ошибка:

UnityException: get_isPlaying is not allowed to be called from a MonoBehaviour constructor (or instance field initializer), call it in Awake or Start instead. Called from MonoBehaviour 'FadePanel' on game object 'Button (Legacy)'. See "Script Serialization" page in the Unity Manual for further details. DG.Tweening.DOTween.InitCheck () (at D:/DG/_Develop/__UNITY_ASSETS/_Demigiant/__DOTween/_DOTween.Assembly/DOTween/DOTween.cs:1128) DG.Tweening.DOTween.Sequence () (at D:/DG/_Develop/__UNITY_ASSETS/_Demigiant/__DOTween/_DOTween.Assembly/DOTween/DOTween.cs:732) FadePanel..ctor () (at Assets/Assets1/scripts/FadePanel.cs:21)

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Сам скрипт:

 using System.Collections; 
using System.Collections.Generic; 
using UnityEngine; 
using UnityEngine.UI; 
using DG.Tweening; 
 
 
public class FadePanel : MonoBehaviour 
{ 
    public CanvasGroup alfaGroup; 
    public RectTransform BuyPanel; 
    private RectTransform shopButt; 
    Vector2 TargetPos; 
    Vector2 StartPos; 
    Vector2 targBut; 
 
    public List<RectTransform> tranf = new List<RectTransform>(); 
 
    private bool isOpen = false; 
 
    Sequence anim = DOTween.Sequence(); 
 
    private void Awake() 
    { 
        TargetPos = BuyPanel.transform.position; 
        StartPos = new Vector2(-Screen.width / 2, StartPos.x); 
 
        targBut = new Vector2(90, 177); 
    } 
 
    private void OnMouseDown() 
    { 
        if (!isOpen) 
        { 
            isOpen = true; 
 
            anim 
                .Append(BuyPanel.DOAnchorPos(TargetPos, 1f).From(StartPos)) 
                .Join(alfaGroup.DOFade(1, 1f).From(0)) 
                .Join(shopButt.DOAnchorPos(targBut, 1f).From(shopButt.position)); 
 
            IconsUp(); 
        } 
        else 
        { 
            anim 
                .Append(alfaGroup.DOFade(0, 1f).From(1)) 
                .Join(shopButt.DOAnchorPos(shopButt.position, 1f).From(targBut)); 
        } 
    } 
 
    private void IconsUp() 
    { 
        for (int i = 0; i < tranf.Count; i++) 
        { 
            anim 
                .Append(tranf[i].DOScale(1, 0.5f).From(0)); 
        } 
    } 
 
}

 

*скрипт установлен на кнопке, который тоже отодвигается при появлении окна