Cannot install - artisan ReflectionException

[alex-dot]

I was trying to get your code running, but somehow I just get an Exception.

After git cloning, I copied .env.example to .env and then ran composer install in the root directory. During postInstall the script is trying to run php artisan optimize. However, that fails with

PHP Fatal error: Uncaught ReflectionException: Class App\Console\Kernel does not exist in /home/alex/bin/Backlog/vendor/laravel/framework/src/Illuminate/Container/Container.php:749

Could you clarify a bit the installation process?