Unknown Entity namespace alias 'Appbundle' - doctrine-orm

Question

I have just started my first symfony project and I'm getting the above error in a more complex situation. To narrow it down I created a new project but the error is there again :/
What I have down:
cd /var/www
sudo symfony new em
cd em
sudo mkdir src/AppBundle/Entity
sudo touch src/AppBundle/Entity/Company.php
sudo chmod -R 777 *
php bin/console doctrine:database:create // db symfony
php bin/console doctrine:generate:entities AppBundle
sudo touch src/AppBundle/Controller/CompanyController.php
sudo chmod -R 777 * // failed to write to cache
When navigating to http://em.at/app_dev.php/companies I get the error!
I already tried Uncaught PHP Exception Doctrine\ORM\ORMException: "Unknown Entity namespace alias 'AppBundle'."
so
php bin/console cache:clear
which resulted in
[Symfony\Component\Filesystem\Exception\IOException]
Failed to remove file "/var/www/em/var/cache/de~/twig/2b/2bef18b12bca6cd9cb
d50ce5b194c23fdc85bb73d29114f27fb3793b7f085d8a.php": .
so I deleted them manually
sudo rm -R cache/de~
sudo rm -R cache/dev
but the error persists. Anyone know what's wrong?.
my files:
<?php
// src/AppBundle/Entity/Company.php
namespace AppBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
/**
* #ORM\Entity
* #ORM\Table(name="company")
*/
class Company
{
/**
* #ORM\Column(type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* #ORM\Column(type="string", length=100)
*/
private $name;
}
and
<?php
// src/AppBundle/Entity/CompanyController.php
namespace AppBundle\Controller;
use AppBundle\Entity\Company;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Request;
class CompanyController extends Controller
{
/**
* #Route("/companies", name="company_list")
*/
public function listAction(Request $request)
{
$companies = $this->getDoctrine()->getRepository('Appbundle:Company')->findAll();
// replace this example code with whatever you need
return $this->render('company/list.html.twig', [
'base_dir' => realpath($this->getParameter('kernel.root_dir').'/..').DIRECTORY_SEPARATOR,
'companies' => $companies
]);
}
}

Answer 1

Did you set the file permissions on your var folder. Form the above messages it looks like you may not have done that. Here's the reference you need:
https://symfony.com/doc/current/setup/file_permissions.html
Also, just in case run:
php bin/symfony_requirements
to make sure you've met all other requirements.
This will save you a lot of grief.