symfony2-easyadmin bundle blank screen error - symfony

Question

i have a strange problem when trying to render entity in symfony2 easyadminBundle i got a blank screen without any errors,
when trying to list entity 'Ads' that has many-to-one relation-ship with entity 'pages' ,where page contains many ads., however if i modified the action parameter in the url to be &action=new instead of &action=list it shows the form but after saving it giving me the same blank screen!
My Pages Entity :
/**
* #var string
*
* #ORM\Column(name="page_name", type="string", length=30, nullable=true)
*/
private $pageName;
/**
* #var integer
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="IDENTITY")
*/
private $id;
/*#ORM\OneToMany(targetEntity="Ads", mappedBy="pages")
*
*/
protected $ads;
public function __construct()
{
$this->ads = new ArrayCollection();
}
}
Ads Entity:
/**
* Ads
*
* #ORM\Table(name="ads")
* #ORM\Entity
*/
class Ads
{
/**
* #var integer
*
* #ORM\Column(name="page_id", type="integer", nullable=false)
*/
private $page_id ;
/**
* #var string
*
* #ORM\Column(name="ad_text", type="text", nullable=false)
*/
private $adText;
/**
* #var integer
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="IDENTITY")
*/
private $id;
/**
* #ORM\ManyToOne(targetEntity="Pages", inversedBy="ads")
* #ORM\JoinColumn(name="page_id", referencedColumnName="id")
*/
private $page_ad;
}

Answer 1

Your configuration looks "not complicated", so it should work as expected. The "blank page" error is really strange. We render the data with try...catch to avoid any issue when we cannot access the information. Besides, we also catch the exceptions to display customized error pages.
Can you see any error message in your dev.log file?
You could also do the following. Create the simplest possible configuration for the list view of the Ads entity as follows:
easy_admin:
entities:
Ads:
list:
fields: ['id']
If this work, try adding more fields one by one until you find the error.