Camera doesn't contain a definition for "main"?

Question

2D

I am writing a 2D platformer, I got to the point where I need to make weapons. I am writing a script, I wrote everything as needed, but unity gives out that Camera does not contain a definition for "main" (camera does not contain a definition for "main").
What to do? Help.
Here is the script:

using UnityEngine;
using System.Collections;

public class FireScript2D : MonoBehaviour
{

    public float speed = 10; // скорость пули
    public Rigidbody2D bullet; // префаб нашей пули
    public Transform gunPoint; // точка рождения
    public float fireRate = 1; // скорострельность
    public bool facingRight = true; // направление на старте сцены, вправо?

    public Transform zRotate; // объект для вращения по оси Z

    // ограничение вращения
    public float minAngle = -40;
    public float maxAngle = 40;

    private float curTimeout, angle;
    private int invert;
    private Vector3 mouse;

    void Start()
    {
        if (!facingRight) invert = -1; else invert = 1;
    }

    void SetRotation()
    {
        Vector3 mousePosMain = Input.mousePosition;
        mousePosMain.z = Camera.main.transform.position.z;
        mouse = Camera.main.ScreenToWorldPoint(mousePosMain);
        Vector3 lookPos = mouse - transform.position;
        angle = Mathf.Atan2(lookPos.y, lookPos.x * invert) * Mathf.Rad2Deg;
        angle = Mathf.Clamp(angle, minAngle, maxAngle);
        zRotate.rotation = Quaternion.AngleAxis(angle, Vector3.forward);
    }

    void Update()
    {
        if (Input.GetMouseButton(0))
        {
            Fire();
        }
        else
        {
            curTimeout = 1000;
        }

        if (zRotate) SetRotation();

        if (angle == maxAngle && mouse.x < zRotate.position.x && facingRight) Flip();
        else if (angle == maxAngle && mouse.x > zRotate.position.x && !facingRight) Flip();
    }

    void Flip() // отражение по горизонтали
    {
        facingRight = !facingRight;
        Vector3 theScale = transform.localScale;
        theScale.x *= -1;
        invert *= -1;
        transform.localScale = theScale;
    }

    void Fire()
    {
        curTimeout += Time.deltaTime;
        if (curTimeout > fireRate)
        {
            curTimeout = 0;
            Vector3 direction = gunPoint.position - transform.position;
            Rigidbody2D clone = Instantiate(bullet, gunPoint.position, Quaternion.identity) as Rigidbody2D;
            clone.velocity = transform.TransformDirection(direction.normalized * speed);
            clone.transform.right = direction.normalized;
        }
    }
}

Thanks in advance.

Answer 1

Camera.main is a shortcut for getting the camera with the "MainCamera" tag. Those. these two lines are the same:

// эта строка
GameObject.Find("MainCamera").GetComponent<Camera>();

// и эта строка
Camera.main;

// одно и то же

You probably removed the camera that Unity automatically adds to the scene. Or renamed the tag.

Answer 2

No camera with mainCamera tag or something like that