本人想在unity當中制作技能的擴展,因為不能在ScriptableObject當中直接使用StartCoroutine,只能在library之中再寫一個function去StartCoroutine一個 IEnumerator funcyion.之後就出現an object reference is required for the non-static field的ERROR,求大神賜教QQ

public class basic_attack : ScriptableObject
{
    public void TriggerSkill()
    {
        testt.activeskill();
    }
}
//以下是library當中的code
public class testt :MonoBehaviour
    {
        
        public static void activeskill()
        {
            StartCoroutine(testtt());
        }

        public  IEnumerator testtt()
        {
                //doing something
                yield return new WaitForSeconds(5f);
                //doing something
        }
    }