Class seems not to be a managed Doctrine entity. Did you forget to map it?

What I'm trying to do is to get an Post(Post Entity) form where I can select a featured picture from another entity(File Entity). At the end I would like to display only the files of type "featured Image" but even if I remove my query_builder I've got a exception that says: Class "Site\Backend\Adminbundle\Entity\File" seems not to be a managed Doctrine entity. Did you forget to map it? Here is my PostType form ``` public function buildForm(FormBuilderInterface $builder, array $options) { $builder ->add('title') ->add('thumb', 'entity', array( 'class' => 'Site\Backend\Adminbundle\Entity\File', 'query_builder' => function(EntityRepository $er) { return $er->createQueryBuilder('f') //->where('f.state = :state') //->setParameter('state', $prms['state']) ->orderBy('f.dateUpdated', 'DESC'); } )) } ``` In the other hand I have my two entities: Here is my File entity ``` <?php namespace Site\Backend\AdminBundle\Entity; use Doctrine\ORM\Mapping as ORM; use Symfony\Component\Validator\Constraints as Assert; use Symfony\Component\HttpFoundation\File\UploadedFile; use Doctrine\Common\Collections\ArrayCollection; /** * Site\Backend\AdminBundle\Entity\File * * @ORM\Table() * @ORM\Entity * @ORM\HasLifecycleCallbacks */ class File { /** * @var integer $id * * @ORM\Column(name="id", type="integer") * @ORM\Id * @ORM\GeneratedValue(strategy="AUTO") */ private $id; /** * @var \DateTime * * @ORM\Column(name="dateCreated", type="datetime") */ private $dateCreated; /** * @var \DateTime * * @ORM\Column(name="dateUpdated", type="datetime") */ private $dateUpdated; /** * @var string $name * * @ORM\Column(name="name", type="string", length=255) */ private $name; /** * @Assert\File(maxSize="6000000") */ private $file; /** * @ORM\Column(type="string", length=255) */ public $path; /** * @ORM\ManyToOne(targetEntity="TypeFile", inversedBy="files") */ private $type; /** * @var string * * @ORM\OneToMany(targetEntity="Site\Backend\BlogBundle\Entity\Post", mappedBy="thumb") */ private $posts; public function __construct() { $this->setDateCreated(new \DateTime()); $this->setDateUpdated(new \DateTime()); $this->type = new ArrayCollection(); } /** * @ORM\PrePersist() * @ORM\PreUpdate() */ public function preUpload() { $this->setDateUpdated(new \DateTime()); if (null !== $this->file) { // do whatever you want to generate a unique name $this->path = sha1(uniqid(mt_rand(), true)) . '.' . $this->file->guessExtension(); } else { //throwException($e); } } /** * @ORM\PostPersist() * @ORM\PostUpdate() */ public function upload() { if (null === $this->file) { return; } // if there is an error when moving the file, an exception will // be automatically thrown by move(). This will properly prevent // the entity from being persisted to the database on error $this->file->move($this->getUploadRootDir(), $this->path); unset($this->file); } /** * @ORM\PostRemove() */ public function removeUpload() { if ($file = $this->getAbsolutePath()) { if (file_exists($file)) { unlink($file); } } } public function getAbsolutePath() { return null === $this->path ? null : $this->getUploadRootDir() . '/' . $this->path; } public function getWebPath() { return null === $this->path ? null : './' . $this->getUploadDir() . '/' . $this->path; } protected function getUploadRootDir() { // the absolute directory path where uploaded documents should be saved return __DIR__ . '/../../../../../web/' . $this->getUploadDir(); } protected function getUploadDir() { // get rid of the __DIR__ so it doesn't screw when displaying uploaded doc/image in the view. return 'uploads/' . $this->type; } /** * Get id * * @return integer */ public function getId() { return $this->id; } /** * Set name * * @param string $name * @return File */ public function setName($name) { $this->name = $name; return $this; } /** * Get name * * @return string */ public function getName() { return $this->name; } /** * Set path * * @param string $path * @return File */ public function setPath($path) { $this->path = $path; return $this; } /** * Get path * * @return string */ public function getPath() { return $this->path; } public function __toString() { return $this->name; } /** * Add type * * @param Site\Backend\AdminBundle\Entity\TypeFile $type * @return File */ public function addType(\Site\Backend\AdminBundle\Entity\TypeFile $type) { $this->type[] = $type; return $this; } /** * Remove type * * @param Site\Backend\AdminBundle\Entity\TypeFile $type */ public function removeType(\Site\Backend\AdminBundle\Entity\TypeFile $type) { $this->type->removeElement($type); } /** * Get type * * @return Doctrine\Common\Collections\Collection */ public function getType() { return $this->type; } /** * Set type * * @param Site\Backend\AdminBundle\Entity\TypeFile $type * @return File */ public function setType(\Site\Backend\AdminBundle\Entity\TypeFile $type = null) { $this->type = $type; return $this; } public function getFile() { return $this->file; } public function setFile($file) { $this->file = $file; } /** * Set dateCreated * * @param \DateTime $dateCreated * @return File */ public function setDateCreated($dateCreated) { $this->dateCreated = $dateCreated; return $this; } /** * Get dateCreated * * @return \DateTime */ public function getDateCreated() { return $this->dateCreated; } /** * Set dateUpdated * * @param \DateTime $dateUpdated * @return File */ public function setDateUpdated($dateUpdated) { $this->dateUpdated = $dateUpdated; return $this; } /** * Get dateUpdated * * @return \DateTime */ public function getDateUpdated() { return $this->dateUpdated; } /** * Add posts * * @param \Site\Backend\BlogBundle\Entity\Post $posts * @return File */ public function addPost(\Site\Backend\BlogBundle\Entity\Post $posts) { $this->posts[] = $posts; return $this; } /** * Remove posts * * @param \Site\Backend\BlogBundle\Entity\Post $posts */ public function removePost(\Site\Backend\BlogBundle\Entity\Post $posts) { $this->posts->removeElement($posts); } /** * Get posts * * @return \Doctrine\Common\Collections\Collection */ public function getPosts() { return $this->posts; } } ``` And Here is my Post entity ``` <?php namespace Site\Backend\BlogBundle\Entity; use Doctrine\ORM\Mapping as ORM; use Doctrine\Common\Collections\ArrayCollection; /** * Post * * @ORM\Table() * @ORM\Entity */ class Post { /** * @var integer * * @ORM\Column(name="id", type="integer") * @ORM\Id * @ORM\GeneratedValue(strategy="AUTO") */ private $id; /** * @var string * * @ORM\Column(name="title", type="string", length=255) */ private $title; /** * @var \DateTime * * @ORM\Column(name="dateCreated", type="datetime") */ private $dateCreated; /** * @var \DateTime * * @ORM\Column(name="dateUpdated", type="datetime") */ private $dateUpdated; /** * @var \DateTime * * @ORM\Column(name="datePublished", type="datetime", nullable=true) */ private $datePublished; /** * @var string * * @ORM\Column(name="state", type="string", length=255) */ private $state; /** * @var string * * @ORM\Column(name="content", type="text") */ private $content; /** * @var Author * @ORM\ManyToOne(targetEntity="Site\Backend\AdminBundle\Entity\User", inversedBy="posts") */ private $author; /** * @var Thumb * @ORM\ManyToOne(targetEntity="Site\Backend\AdminBundle\Entity\File", inversedBy="posts") */ private $thumb; /** * @var Comments * @ORM\OneToMany(targetEntity="Comment", mappedBy="post") */ private $comments; /** * @var Categories * @ORM\ManyToMany(targetEntity="Category", cascade={"persist"}) */ private $categories; /** * @var Tags * @ORM\ManyToMany(targetEntity="Tag", cascade={"persist"}) */ private $tags; /** * Constructeur */ public function __construct() { $this->setDateCreated(new \DateTime()); $this->setDateUpdated(new \DateTime()); $this->comments = new ArrayCollection(); $this->Categories = new ArrayCollection(); $this->tags = new ArrayCollection(); } public function __toString(){ return $this->title; } /** * Get id * * @return integer */ public function getId() { return $this->id; } /** * Set title * * @param string $title * @return Post */ public function setTitle($title) { $this->title = $title; return $this; } /** * Get title * * @return string */ public function getTitle() { return $this->title; } /** * Set dateCreated * * @param \DateTime $dateCreated * @return Comment */ public function setDateCreated($dateCreated) { $this->dateCreated = $dateCreated; return $this; } /** * Get dateCreated * * @return \DateTime */ public function getDateCreated() { return $this->dateCreated; } /** * Set dateUpdated * * @param \DateTime $dateUpdated * @return Comment */ public function setDateUpdated($dateUpdated) { $this->dateUpdated = $dateUpdated; return $this; } /** * Get dateUpdated * * @return \DateTime */ public function getDateUpdated() { return $this->dateUpdated; } /** * Get datePublished * * @return \DateTime */ public function getDatePublished() { return $this->datePublished; } /** * Set datePublished * * @param \DateTime $datePublished * @return Comment */ public function setDatePublished($datePublished) { $this->datePublished = $datePublished; return $this; } /** * Set state * * @param string $state * @return Post */ public function setState($state) { $this->state = $state; return $this; } /** * Get state * * @return string */ public function getState() { return $this->state; } /** * Set content * * @param string $content * @return Post */ public function setContent($content) { $this->content = $content; return $this; } /** * Get content * * @return string */ public function getContent() { return $this->content; } /** * Set author * * @param \Site\Backend\AdminBundle\Entity\User $author * @return Post */ public function setAuthor(\Site\Backend\AdminBundle\Entity\User $author = null) { $this->author = $author; return $this; } /** * Get author * * @return \Site\Backend\AdminBundle\Entity\User */ public function getAuthor() { return $this->author; } /** * Add comments * * @param \Site\Backend\BlogBundle\Entity\Comment $comments * @return Post */ public function addComment(\Site\Backend\BlogBundle\Entity\Comment $comments) { $this->comments[] = $comments; return $this; } /** * Remove comments * * @param \Site\Backend\BlogBundle\Entity\Comment $comments */ public function removeComment(\Site\Backend\BlogBundle\Entity\Comment $comments) { $this->comments->removeElement($comments); } /** * Get comments * * @return \Doctrine\Common\Collections\Collection */ public function getComments() { return $this->comments; } /** * Add Categories * * @param \Site\Backend\BlogBundle\Entity\Category $categories * @return Post */ public function addCategory(\Site\Backend\BlogBundle\Entity\Category $category) { $this->categories[] = $category; return $this; } /** * Add Categories * * @param \Site\Backend\BlogBundle\Entity\Category $categories * @return Post */ public function addCategoriesNew(\Site\Backend\BlogBundle\Entity\Category $category) { $this->categories[] = $category; return $this; } /** * Remove Categories * * @param \Site\Backend\BlogBundle\Entity\Category $categories */ public function removeCategory(\Site\Backend\BlogBundle\Entity\Category $category) { $this->categories->removeElement($category); } /** * Remove Categories * * @param \Site\Backend\BlogBundle\Entity\Category $categories */ public function removeCategoriesNew(\Site\Backend\BlogBundle\Entity\Category $category) { } /** * Get Categories * * @return \Doctrine\Common\Collections\Collection */ public function getCategories() { return $this->categories; } /** * Get Categories * * @return \Doctrine\Common\Collections\Collection */ public function getCategoriesNew() { //return $this->categories; } /** * Add tags * * @param \Site\Backend\BlogBundle\Entity\tag $tags * @return Post */ public function addTag(\Site\Backend\BlogBundle\Entity\Tag $tags) { $this->tags[] = $tags; return $this; } /** * Add tags * * @param \Site\Backend\BlogBundle\Entity\tag $tags * @return Post */ public function addTagsNew(\Site\Backend\BlogBundle\Entity\Tag $tags) { $this->tags[] = $tags; return $this; } /** * Remove tags * * @param \Site\Backend\BlogBundle\Entity\Tag $tags */ public function removeTag(\Site\Backend\BlogBundle\Entity\Tag $tags) { $this->tags->removeElement($tags); } /** * Remove Tags * * @param \Site\Backend\BlogBundle\Entity\tag $tags */ public function removeTagsNew(\Site\Backend\BlogBundle\Entity\Tag $tags) { //$this->tags->removeElement($tags); } /** * Get Tags * * @return \Doctrine\Common\Collections\Collection */ public function getTags() { return $this->tags; } /** * Get Tags * * @return \Doctrine\Common\Collections\Collection */ public function getTagsNew() { //return $this->Tags; } /** * Add Categories * * @param \Site\Backend\BlogBundle\Entity\Category $categories * @return Post */ public function addCategorie(\Site\Backend\BlogBundle\Entity\Category $categories) { $this->categories[] = $categories; return $this; } /** * Remove Categories * * @param \Site\Backend\BlogBundle\Entity\Category $categories */ public function removeCategorie(\Site\Backend\BlogBundle\Entity\Category $categories) { $this->categories->removeElement($categories); } /** * @ORM\preUpdate */ public function setUpdateValue(){ $this->setDateUpdated(new \DateTime()); } /** * Set thumb * * @param \Site\Backend\AdminBundle\Entity\File $thumb * @return Post */ public function setThumb(\Site\Backend\AdminBundle\Entity\File $thumb = null) { $this->thumb = $thumb; return $this; } /** * Get thumb * * @return \Site\Backend\AdminBundle\Entity\File */ public function getThumb() { return $this->thumb; } } ``` Thanks in advance I hope I was clear, if It is not the case please tell me.