Ошибка "CS0149 Method name expected" - C#

Формулировка задачи:

Помогите, пожалуйста, разобраться. Никак не могу разобраться в чем именно ошибка, указывает на эту строку: Appodeal.show(Appodeal.REWARDED_VIDEO)( (bool success) => {

buttonUnlock.onClick.AddListener (() => {
            buttonUnlock.transform.DOScale(Vector3.zero,0.3f);

            if (Appodeal.isLoaded(Appodeal.REWARDED_VIDEO))
            {
                Appodeal.show(Appodeal.REWARDED_VIDEO)( (bool success) => {
                    if(success)
                    {
                        FindObjectOfType<GameManager>().AnimationCameraSuccess();
                    }
                    else
                    {
                        print("the video is not finished or not displayed");
                    }
                });
            }
        });
 
        buttonUnlock.transform.localScale = Vector3.zero;

Решение задачи: «Ошибка "CS0149 Method name expected"»

textual
                            Листинг программы 
                        

                                /// <summary>
    /// Method called when the player clicked on the right arrow on the roght of the level text on the top of the screen during the game
    /// </summary>
    private void OnClickedButtonNextLevel()
    {
        PlayNextLevel ();
 
    }
 
    /// <summary>
    /// Method called when the player failed and so ... we replay the current level
    /// </summary>
    private void ReplayCurrentLevel(int level)
    {
        Camera.main.transform.DOMove (new Vector3 (0, Camera.main.transform.position.y, -10), 0.3f).OnComplete (() => {
            PlayLevel (level);
        });
 
    }
 
    /// <summary>
    /// Method called when the player have to play the next level (if the current level is cleared, or if the payer taps/Clicks on the next button or if the player see a rewarded video to unlock the current level
    /// </summary>
    private void PlayNextLevel()
    {
        int last = lastLevel;
 
        last++;
 
        Camera.main.transform.DOMove (new Vector3 (50, Camera.main.transform.position.y, -10), 0.3f).OnComplete (() => {
 
            Camera.main.transform.position = new Vector3 (-50, Camera.main.transform.position.y, -10);
 
            Camera.main.orthographicSize = 20f;
 
            SetLevelText (last);
 
            PlayLevel (last);
 
            Camera.main.transform.DOMove (new Vector3 (0, Camera.main.transform.position.y, -10), 0.3f).OnComplete (() => {
            });
        });
    }
    void Start()
    {
        String appKey = "dd241bc31bde3ab2369aa13e6680311d500dfce2c36c64f5";
        Appodeal.initialize(appKey, Appodeal.INTERSTITIAL | Appodeal.NON_SKIPPABLE_VIDEO | Appodeal.BANNER | Appodeal.REWARDED_VIDEO);
    }
}
                        