*Suddenly* GameObject does not contain a definition for 'FindGameObjectWithTag'


First time posting question.

Yesterday after programing in unity, suddenly appeared in the console 73 errors.

Most of them was GameObject does not contain a definition for ‘FindGameObjectWithTag’

In addition there were these errors:

GameObject does not contain a definition for ‘Find’.
GameObject does not contain a definition for ‘SetActive’.

Been working this game for month!.
I have to get your help!!



Thank you for replying!

Adding “UnityEngine” solved some of the problem’ it solved the part of FindGameObjectWithTag(“”) and Find().

still have errors related to GameObject such as:

FindGameObjectsWithTag (Objects in plural)

and SetActive()

in this code even if I add UnityEngine before FindGameObjectsWithTag (Objects in plural) it does not work.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class obstacleMovement : MonoBehaviour
    public Rigidbody2D rb;
    public GameObject[] obstacle;
    public Vector3 playerPosition;

    public Vector3 Movement = new Vector3(0, 0, 0);
    private Vector3 dir = new Vector3();
    private float repelRange = 6f;
    private Vector2 repelForce;
    public Vector2 newPos;

    public float speed;
    public float maxDistanceFromPlayer;

    void Start()
        speed = UnityEngine.GameObject.Find("gamemanager").GetComponent<gameManager>().speed1;
        maxDistanceFromPlayer = UnityEngine.GameObject.FindGameObjectWithTag("obstacle").GetComponent<ObstacleSpawning>().radius * 2.5f;


    // Update is called once per frame
    void FixedUpdate()

        //Movement = Vector3.MoveTowards(transform.position, playerPosition, 10 * Time.deltaTime);
        //Movement = new Vector3(Movement.x, Movement.y, 0f);
        obstacle = GameObject.FindGameObjectsWithTag("obstacle11");
        playerPosition = UnityEngine.GameObject.FindGameObjectWithTag("Player").transform.position;
        Vector2 repelForce = Vector2.zero;

        foreach (GameObject obstacle1 in obstacle)
            dir = rb.transform.position - obstacle1.transform.position;
            Vector2 dir1 = dir;
            if ((obstacle1.transform.position - rb.transform.position).magnitude <= repelRange)
                repelForce += (rb.position - (Vector2)obstacle1.transform.position).normalized;

            if ((playerPosition - obstacle1.transform.position).magnitude >= maxDistanceFromPlayer)


        Vector2 dirr = ((Vector2)playerPosition - (Vector2)rb.position).normalized;
        float rotateAmount = Vector3.Cross(dirr, transform.up).z;
        float turnSpeed = 200f;

        Vector2 newPos = transform.position + transform.up * Time.fixedDeltaTime * speed;
        newPos += repelForce * Time.deltaTime;
        rb.angularVelocity =-rotateAmount * turnSpeed;

        //following script lines make the game harder
        //they make enemies faster but spawn them farther away




hello, if that solved some errors is because you have created a class called GameObject that is overrdiding unity implementation. if you didnt have any errors before i would sugest searching for that class (is as easy as remove the UnityEngine. that i suggested and right click and go to implementation there will be probably your custome class or a class from a plugin) or just search in the assets folder.