Trait 'Illuminate\Foundation\Auth\AuthenticatesUsers' not found on laravel 7x

Title: Troubleshooting 'Illuminate\Foundation\Auth\AuthenticatesUsers' Not Found Error in Laravel 7x Projects Body:

The error message "Trait 'Illuminate\Foundation\Auth\AuthenticatesUsers' not found" when navigating to the admin login page of your Laravel project can be confusing, especially if you are using Laravel version 7.x. In this blog post, we will discuss various possible causes of this issue and provide solutions to help you overcome it.

<?php

namespace App\Http\Controllers\Admin;

use Illuminate\Http\Request;
use App\Http\Controllers\Controller;
use Illuminate\Foundation\Auth\AuthenticatesUsers;


class LoginController extends Controller
{
    use AuthenticatesUsers;

    /**
     * Where to redirect admins after login.
     *
     * @var string
     */
    protected $redirectTo = '/admin';

    /**
     * Create a new controller instance.
     *
     * @return void
     */
    public function __construct()
    {
        $this->middleware('guest:admin')->except('logout');
    }

    /**
     * @return \Illuminate\Contracts\View\Factory|\Illuminate\View\View
     */
    public function showLoginForm()
    {
        return view('admin.auth.login');
    }
}

The first step is to ensure that the Trait 'Illuminate\Foundation\Auth\AuthenticatesUsers' is correctly included in your project. If you are using Composer, make sure to run a composer update or install command to get the latest version of Laravel. However, sometimes updating or installing may not solve the issue. In this case, there could be other possible causes:

Incorrect Namespace: Ensure that your controller and trait are in the correct namespace. If they are in different namespaces, you might encounter problems with autoloading. Double-check that both the controller and trait have been properly declared and imported.
Outdated Composer: Sometimes, an outdated Composer installation can lead to such issues. Update your Composer to the latest version using the command 'composer self-update'. This ensures that you are working with a stable environment.
Missing Classmap or ServiceProvider: Laravel uses a classmap and service provider to enable autoloading of classes. If any of these files is missing or not configured correctly, your project might encounter issues. Ensure that you have defined all required classes in the 'config/app.php' file.
Incorrect Server Configurations: Uninstalled or incorrectly installed PHP extensions can cause this issue. Check if all necessary extensions are available and correctly configured on your server. For example, you might need to enable the extensions 'intl', 'mbstring', and 'pdo_mysql' for Laravel.
Wrong Coding Standards: Ensure that your code adheres strictly to coding standards. Incorrect use of namespaces, classes, or traits can result in issues like this one. Always double-check your coding practices and follow the given guidelines.

Laravel Company