MyClockScript.cs(6,14): error CS0101: The namespace `global::' already contains a definition for `MyClockScript'

I don’t see the error anywhere and it’s on two other scripts :

Here is the script :

using UnityEngine;
using System.Collections;
using UnityEngine.UI;
using UnityEngine.SceneManagement;

public class MyClockScript : MonoBehaviour
{
    public int  Minutes = 0;
    public int  Seconds = 0;

    private Text m_text;
    public float m_leftTime;

    private float msecs;
    private int savedSeconds;

    public void Awake()
    {
        m_text = GetComponent<Text>();
        msecs = 0.0f;

        // the following allows you to either set Minutes && Seconds in the inspector
        // or allows you to set m_leftTime in the inspector as the starting countdown for the clock
        // Minutes && Seconds overrules m_leftTime
        if ((Minutes == 0) && (Seconds == 0) && (m_leftTime != 0.0f))
        {
            // initialize Minutes & Seconds based on m_leftTime being set in the inspector
            Minutes = Mathf.FloorToInt(m_leftTime / 60f);
            Seconds = Mathf.FloorToInt(m_leftTime % 60f);
        }
        else if ((Minutes != 0) || (Seconds != 0))
        {
            // initialize m_leftTime based on Minutes or Seconds being set in the inspector
            m_leftTime = (Minutes * 60) + Seconds;
        }
        savedSeconds = Seconds;
    }

    public void Update()
    {
        // count down in seconds
        msecs += Time.deltaTime;
        if(msecs >= 1.0f)
        {
            msecs -= 1.0f;
            Seconds--;
            if(Seconds < 0)
            {
                Seconds = 59;
                Minutes--;
            }
            m_leftTime = (Minutes * 60) + Seconds;
        }
        
        if (Seconds != savedSeconds)
        {
            //  Show current clock
            m_text.text = string.Format("Time : {0}:{1:D2}", Minutes, Seconds);
            savedSeconds = Seconds;
        }
    }
}

It seems that you have got several classes with the name MyClockScript, which is not allowed in C#