facing issue in GameControl.cs of FlappyBird (Unity Tutorials)

Hi Fellows,
I’m facing issue in making Flappy Bird game as per Unity Tutorials.
The screenshot of red lined text is attached along with it’s reason.
Guide me, how to fix it?

Your GameControl script is a MonoBehaviour that is attached to a GameObject.

SetActive(…) is a function you can call on GameObjects.

You can get the GameObject the MonoBehaviour belongs to, and call SetActive on it like this:

gameOverText.gameObject.SetActive(true);