Class "app\providers\fortifyserviceprovider" not found

To resolve this issue, follow these steps:

1. Ensure that the `FortifyServiceProvider` class exists:
- Check if you have a file named `FortifyServiceProvider.php` in your `app/Providers` directory.
- Verify that the namespace at the top of the file matches the directory structure: `namespace App\Providers;`.

2. Register the `FortifyServiceProvider` in your application:
- Open your `config/app.php` file.
- In the `providers` array, add the `FortifyServiceProvider`:

php
'providers' => [
    // ...
    App\Providers\FortifyServiceProvider::class,
],

3. Ensure that the `FortifyServiceProvider` is properly implemented:
- Open your `FortifyServiceProvider` class.
- Verify that the class extends `Illuminate\Support\ServiceProvider` and implements the necessary methods, such as `register()` and `boot()`.

php
<?php

namespace App\Providers;

use Laravel\Fortify\Fortify;
use Illuminate\Support\ServiceProvider;

class FortifyServiceProvider extends ServiceProvider
{
    /**
     * Register any application services.
     *
     * @return void
     */
    public function register()
    {
        //
    }

    /**
     * Bootstrap any application services.
     *
     * @return void
     */
    public function boot()
    {
        Fortify::createUsersUsing(CreateNewUser::class);
        // ...
    }
}

4. Clear the application cache:
- Run the command `php artisan config:clear` to clear the cached configuration files.
- Run the command `php artisan cache:clear` to clear the application cache.