Trying to Invoke method: CallZombies.Spawn couldn’t be called

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void PrepareSpawn() {
        //  检测个数，是否继续生成
        if(spawnPoint.childCount >= maxChildNum) {
            return;
        }
        
        //  血量太低停止召唤，召唤一个需要消耗1%血量
        if (enemyHealth.currentHealth > enemyHealth.startingHealth * 0.1f) {
            enemyHealth.currentHealth -= (int)(0.01f * enemyHealth.startingHealth);
        } else {
            return;
        }

        //  播放技能动画
        Animator anim = GetComponent<Animator>();
        anim.SetTrigger("ShowSkill");
        
        Invoke("Spawn", 1f);
    }
    
void Spwan() {
        // 音效
        audioSource.clip = callZombiesAudio;
        audioSource.Play();

        //	设置物品编号
        zombiesIndex = Random.Range(0, zombiePrefab.Length);

        //	设置真实刷新位置
        Vector3 realSpawnPoint;
        float shiftingX = Random.Range(-maxShiftingValue, +maxShiftingValue);   //	刷新位置X轴随机偏移值
        float shiftingZ = Random.Range(-maxShiftingValue, +maxShiftingValue);   //	刷新位置Z轴随机偏移值
        realSpawnPoint.x = transform.position.x + shiftingX;
        realSpawnPoint.z = transform.position.z + shiftingZ;
        realSpawnPoint.y = transform.position.y;

        //  设置刷新点方向
        Quaternion spawnRotation = transform.rotation;      //	当前BOSS的旋转角度
        //Quaternion spawnRotation = Quaternion.identity;   //	默认(0,0,0)旋转角度

        //	在刷新点上刷新物品
        GameObject go = (GameObject)Instantiate(zombiePrefab[zombiesIndex], realSpawnPoint, spawnRotation);

        //	设置父子关系，把物品放在刷新点下
        go.transform.SetParent(spawnPoint);

        //print(go.name + ":已刷新"); //test
    }