hossein@hossein-ubuntu:~/Desktop$ ls
composer.phar  video-share
hossein@hossein-ubuntu:~/Desktop$ cd video-share/
hossein@hossein-ubuntu:~/Desktop/video-share$ ls
app        composer.json  package.json  README.md  server.php  webpack.mix.js
artisan    config         phpunit.xml   resources  storage
bootstrap  database       public        routes     tests
hossein@hossein-ubuntu:~/Desktop/video-share$ php artisan serve
PHP Warning:  require(/home/hossein/Desktop/video-share/vendor/autoload.php): Failed to open stream: No such file or directory in /home/hossein/Desktop/video-share/artisan on line 18
PHP Fatal error:  Uncaught Error: Failed opening required '/home/hossein/Desktop/video-share/vendor/autoload.php' (include_path='.:/usr/share/php') in /home/hossein/Desktop/video-share/artisan:18
Stack trace:
#0 {main}
  thrown in /home/hossein/Desktop/video-share/artisan on line 18
hossein@hossein-ubuntu:~/Desktop/video-share$