Why is migration generation not working in Laravel 5?

Question

Laravel

I'm using Ubuntu 14.04
Installed Composer 1.3.2, Laravel 5.2.45
In the terminal I generate a migration file, I write:
php artisan generate:migration create_users_table --fields="email:string:unique, password:string[60], username:string:unique , remember_token:string:nullable"
Throws an error:
[ErrorException]
file_put_contents(/var/www/html/laravel/quickstart/app/database/migration
s/2017_03_28_124903_create_users_table.php): failed to open stream: No such
file or directory.
For some reason, Artisan by default climbs to create a migration file in the folder
[default: "/var/www/html/dpirmatov/quickstart/app/database/migrations"]
Then I write:
php artisan generate:migration create_users_table --fields="email:string:unique, password:string[60], username:string:unique, remember_token:string:nullable" --path=database/migrations
artisan response:
[Symfony\Component \Console\Exception\CommandNotFoundException]
Command "dump-autoload" is not defined.