Unity　スクリプトでアクセスができないとエラーがでるのですが、修正方法がわかりません。

別のスクリプトからメソッドを読み込みたいのですが、エラーがでます。
どう変更したらいいのでしょうか？どうぞよろしくお願いします。

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
namespace Qm
{

    public class QuestionManager : MonoBehaviour
    {
        [Header("Questions")]
        [SerializeField] QuestionDataList[] questionDataLists;

        [Header("Question UI")]
        [SerializeField] Text questionText = null;

        [Header("Question UI")]
        [SerializeField] Text answerText = null;



        private int questionNumber;
        void Start()
        {
            SetupQuestion();
        }

        private void SetupQuestion()
        {
            questionNumber = Random.Range(0, 81);
            questionText.text = questionDataLists[questionNumber].GetQuestion();
        }
        private void SetupAnswer()←これを読み込みたいです。
        {
            answerText.text = questionDataLists[questionNumber].GetAnswer();

        }
        public void QuestionButton()
        {
            SetupQuestion();
        }
        public void AnswerButton()
        {
            SetupAnswer();
        }
        public void ClearText()
        {
            answerText.text = "";
        }
    }
}

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using answer;
using Qm;

public class SpawnManager : MonoBehaviour
{
    
    public GameObject targetObject1;
    public GameObject targetObject2;
    public GameObject[] firePrefabs;
    void Update()
    {
        Bottun answer = targetObject1.GetComponent<Bottun>();
        QuestionManager Qm = targetObject2.GetComponent<QuestionManager>();
        if (answer.Push_Button() && **Qm.SetupAnswer()下にエラーがつきます**)
        {
            int fireIndex = Random.Range(0, 3);
            Instantiate(firePrefabs[fireIndex], new Vector2(0, 235), firePrefabs[fireIndex].transform.rotation);
        }
    }
}