C# Unity教程，IEnumerator ShotEffect（），错误

[Unity版本5.6.1f1；Visual Studio 2017]

嗨， 我正在使用Raycast学习基本的Unity FPS教程。我打电话时出错了

私有IEnumerator效应

如下:

功能本地功能在C4中不可用。请使用语言版本7或更高版本

我该如何解决这个问题？这是从Unity教程复制/粘贴的。除了这种类型的呼叫，还有其他选择吗

您已经在更新函数中定义了ShotEffect。检查你的牙套

    void Update() {
        if (Input.GetButtonDown("Fire1") && Time.time > nextFire)
        {
            // Update the time when our player can fire next
            nextFire = Time.time + fireRate;

            // Start our ShotEffect coroutine to turn our laser line on and off
            StartCoroutine(ShotEffect()); //**Call here**

            // Create a vector at the center of our camera's viewport
            Vector3 rayOrigin = fpsCam.ViewportToWorldPoint(new Vector3(0.5f, 0.5f, 0.0f));

            // Declare a raycast hit to store information about what our raycast has hit
            RaycastHit hit;

        }

    } // Add brace here

    private IEnumerator ShotEffect()
    {
        // Play the shooting sound effect
        gunAudio.Play();

        // Turn on our line renderer
        laserLine.enabled = true;

        //Wait for .07 seconds
        yield return shotDuration;

        // Deactivate our line renderer after waiting
        laserLine.enabled = false;
    }

    void Update() {
        if (Input.GetButtonDown("Fire1") && Time.time > nextFire)
        {
            // Update the time when our player can fire next
            nextFire = Time.time + fireRate;

            // Start our ShotEffect coroutine to turn our laser line on and off
            StartCoroutine(ShotEffect()); //**Call here**

            // Create a vector at the center of our camera's viewport
            Vector3 rayOrigin = fpsCam.ViewportToWorldPoint(new Vector3(0.5f, 0.5f, 0.0f));

            // Declare a raycast hit to store information about what our raycast has hit
            RaycastHit hit;

        }

    } // Add brace here

    private IEnumerator ShotEffect()
    {
        // Play the shooting sound effect
        gunAudio.Play();

        // Turn on our line renderer
        laserLine.enabled = true;

        //Wait for .07 seconds
        yield return shotDuration;

        // Deactivate our line renderer after waiting
        laserLine.enabled = false;
    }