Unity - Can't Load Script From Another Script - "The type or namespace name ~ ScriptName ~ could not be found"

Hello, I’m trying to load a script called PlayerInputHandler.cs inside another script called Shoot.cs

This is part of the code:

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


public class Shoot : MonoBehaviour
{
    ......
    ......

    PlayerInputHandler m_InputHandler;

    // Start is called before the first frame update
    void Start()
    {
        m_InputHandler = GetComponent<PlayerInputHandler>();
    }

The error I get is:

Shoot.cs 34,5 The type or namespace name PlayerInputHandler could not be found (are you missing a using directive or an assembly reference'

And this is the line of code it sends me to(line 34):

PlayerInputHandler m_InputHandler;

Note: I used a Unity’s template for a first-person shooter game, and it loads the PlayerInputHandler in other scripts in it works fine like this one:

using Unity.FPS.Game;
using UnityEngine;
using UnityEngine.Events;

namespace Unity.FPS.Gameplay
{
    [RequireComponent(typeof(CharacterController), typeof(PlayerInputHandler), typeof(AudioSource))]
    public class PlayerCharacterController : MonoBehaviour
    {
        [Header("References")] [Tooltip("Reference to the main 
       ...... // There Are more things here//
       PlayerInputHandler m_InputHandler;

               void Start()
        {
            m_InputHandler = GetComponent<PlayerInputHandler>();
            DebugUtility.HandleErrorIfNullGetComponent<PlayerInputHandler, PlayerCharacterController>(m_InputHandler,
                this, gameObject);
        }

Scripts path:
Assets/Avatars/IronMan/Scripts/Shoot.cs
Assets/FPS/Scripts/Gameplay/Managers/PlayerInputHandler.cs
Assets/FPS/Scripts/Gameplay/Managers/PlayerInputHandler.cs

HI, I just got into unity and started playing around with it by using one of the tutorials. Essentially, the answer is to make sure all script files have line endings consistent with your development system.