Another "The class 'X' was not found in the chain configured namespaces - symfony

Question

I get this error when I'm persisting my entity
Another "The class 'X' was not found in the chain configured namespaces
This used to work before I moved my Symfony from windows to Linux.
my controller:
public function SubscriptionHandlingAction(Request $request)
{
if ($request->isMethod('POST'))
{
$form = $this->createForm(new NewCustomer(), new Customer());
$form->bind($request);
if ($form->isValid())
{
// get the form data
$newcustomer = $form->getData();
//get the date and set it in the entity
$datecreation = new \DateTime(date('d-m-Y'));
$newcustomer->setdatecreation($datecreation);
//this works fine
echo $newcustomer->getname();
//persist the data
$em = $this->getDoctrine()->getManager();
$em->persist($newcustomer);
$em->flush();
return $this->render('NRtworksSubscriptionBundle:Subscription:subscription_success.html.twig');
}
Of course, my class entity exists, as I can create form based on it, objects etc.
However, this entity is not "mapped" meaning doctrine:mapping:info doesn't give me anything (but I've created manually the corresponding sdl table and put all the annotations):
<?php
namespace NRtworks\SubscriptionBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\Validator\Constraints as Assert;
/**
* #ORM\Entity
* #ORM\Table(name="Customer")
*/
class Customer
{
/**
* #ORM\Id
* #ORM\Column(type="integer")
* #ORM\GeneratedValue(strategy="AUTO")
*/
protected $idCustomer;
/**
* #ORM\Column(type="string", length=100, unique = true)
*/
protected $name;
/**
* #ORM\Column(type="string", length=50)
*/
protected $country;
/**
* #ORM\Column(type="datetime", nullable = false)
*/
protected $datecreation;
/**
* #ORM\Column(type="integer", length = 5, nullable = false)
*/
protected $admin_user;
//getter
// no need for that
// setter
// no need for that
}
?>
Any hint(s) of the issue ?
Big thanks

Answer 1

Are you working with multiple entity managers or connections? Make sure each em matches with the corresponding bundles in config.yml under
doctrine:
dbal:
#connection info (driver/host/port/...)
orm:
entity_managers:
manager_one:
connection: # your connection (eg: 'default:'
mappings:
YourRespectiveBundle: ~
AnotherrespectiveBundle: ~
This tripped me up the first time I used multiple ems.
Otherwise check AppKernel.php for your bundle, and double check the db connection is correct.