PHP laravel error when running any php artisan command - php

Question

EDIT: So I am trying to use a Laravel project that I already used before, whenever i use:
php artisan migrate
I immediately get:
PHP Fatal error: Uncaught exception 'ReflectionException' with message 'Class HelloVideo\Console\Kernel does not exist' in /var/www/html/orange/php/application/vendor/laravel/framework/src/Illuminate/Container/Container.php:776
And afterward, whenever I use any php artisan the same error keeps showing up.
Composer.json:
{
"name": "laravel/laravel",
"description": "The Laravel Framework.",
"keywords": ["framework", "laravel"],
"license": "MIT",
"type": "project",
"require": {
"laravel/framework": "5.0.*"
},
"require-dev": {
"phpunit/phpunit": "~4.0",
"phpspec/phpspec": "~2.1"
},
"autoload": {
"classmap": [
"database"
],
"psr-4": {
"App\\": "app/"
}
},
"autoload-dev": {
"classmap": [
"tests/TestCase.php"
]
},
"scripts": {
"post-install-cmd": [
"php artisan clear-compiled",
"php artisan optimize"
],
"pre-update-cmd": [
"php artisan clear-compiled"
],
"post-update-cmd": [
"php artisan optimize"
],
"post-create-project-cmd": [
"php -r \"copy('.env.example', '.env');\"",
"php artisan key:generate"
]
},
"config": {
"preferred-install": "dist"
}
}

Answer 1

Your composer.json has the following psr-4 autoloading configuration:
"psr-4": {
"App\\": "app/"
}
However, it appears the namespace of your app is HelloVideo. Change to the following:
"psr-4": {
"HelloVideo\\": "app/"
}
Then run composer dump-autoload.