PHP Fatal error: Cannot declare class SeasonFactory, because the name is already in use in /database/factories/SeasonFactory.php on line 8

Laravel Framework 6.10.1

PHPUnit 8.5.2

I have a factory class as follows:

SeasonFactory.php

<?php

/** @var \Illuminate\Database\Eloquent\Factory $factory */

use App\Season;
use App\Contestant;

class SeasonFactory
{
    public $contestantsCount = 0;

    public function withContestants($count)
    {
        $this->contestantsCount = $count;

        return $this;
    }

    public function create()
    {
        $season = factory(Season::class)->create();

        factory(Contestant::class, $this->contestantsCount)->create([
            'season_id' => $season->id,
        ]);

        return $season;
    }
}

I'm trying to execute a test case as follows

public function will_example_work() {
      $season = app(SeasonFactory::class)
            ->withContestants(20)
            ->create();
}

It gives the following error: PHP Fatal error: Cannot declare class SeasonFactory, because the name is already in use in /database/factories/SeasonFactory.php on line 8

How can I fix this issue?

Note: this command I have executed already: php artisan clear-compiled && php artisan cache:clear && php artisan view:clear && php artisan route:clear && composer dump-autoload && php artisan optimize && php artisan config:clear