Added Progress Bar on Seeding

SeedingProgressBar.php

<?php

namespace App\Traits;

trait SeedingProgressBar
{
    public function run()
    {
        $seeders = $this->seeders;
        
        $this->command->info('Seeding ' . __CLASS__ . '...');
        $this->command->getOutput()->progressStart(count($seeders));
        
        foreach ($seeders as $class => $is_class) {
            if ($is_class) {
                $this->call($class, true);
            } else {
                $method = $class;
                $this->$method();
            }
            $this->command->getOutput()->progressAdvance();
        }
        $this->command->getOutput()->progressFinish();
    }
}

Hello. I have problem.
Illuminate\Contracts\Container\BindingResolutionException : Target class [MessageFactorySeeder] does not exist.

I have DatabaseSeeder and MessageFactorySeeder in one folder.

should I add something to composer?

    "autoload-dev": {
        "psr-4": {
            "Tests\\": "tests/",
            "Database\\": "database/"
        }
    },