Fix Class UsersTableSeeder does not exist (Laravel)

the seeder UsersTableSeeder does exist but -> php artisan db:seed say it doesn’t exist

just type this on command line

project-folder $ composer dump-autoload

source: https://laravel.io/forum/01-31-2015-laravel5-seeder-reflectionexception-class-tableseeder-does-not-exist-in-illuminatecontainercontainerphp776