Failed Opening autoload.php in Laravel 5

I have recently installed Laravel via Composer but I keep get the following error:

Warning: require(/home/leovoon/public_html/laravel-eee/bootstrap/../vendor/autoload.php): failed to open stream: No such file or directory in /home/leovoon/public_html/laravel-eee/bootstrap/autoload.php on line 17

Fatal error: require(): Failed opening required '/home/leovoon/public_html/laravel-eee/bootstrap/../vendor/autoload.php' (include_path='.:/opt/cpanel/ea-php71/root/usr/share/pear') in /home/leovoon/public_html/laravel-eee/bootstrap/autoload.php on line 17

Am I missing something? Because I followed it step by step.

via Chebli Mohamed