"Screen position out of view frustum" in Unity 3D

Question

I'm trying to dynamically set the position and size of my camera in my scene,If I execute the below code the error occurs.It works fine if I set the properties in my scene,so the error is in my code

Error : Screen position out of view frustum (screen pos 959.000000, 454.000000) (Camera rect 0 0 960 907) UnityEngine.SendMouseEvents:DoSendMouseEvents(Int32)

using UnityEngine;
public class CameraInt : MonoBehaviour
{
    public Camera cam1;
    private int row, col;
    private float size;
    void Start()
    {
        MazeLoader ml = gameObject.AddComponent<MazeLoader>();
        row = ml.mazeRows;
        col = ml.mazeColumns;
        size = ml.size;
        float r = row * size / 2;
        cam1.transform.Translate(new Vector3(r, 0,col*size/2),Space.World);
        cam1.orthographicSize = r;
    }
}

• Camera View : Orthographic
• Unity version : 2019.3.13f1

Answer 1

The error occurs if camera size is set to 0

this line was the cause of error : cam1.orthographicSize = r;