symfony - Symfony2 Sonata: No Entity Manager in Custom Class -


i'm trying create custom form in sonata-admin , im geting no entity manager defined class school\childbirthbundle\entity\datachapter

my code:

namespace school\childbirthbundle\admin; use sonata\adminbundle\admin\admin; use sonata\adminbundle\form\formmapper; use sonata\adminbundle\datagrid\datagridmapper; use sonata\adminbundle\datagrid\listmapper; use sonata\adminbundle\show\showmapper; use knp\menu\iteminterface menuiteminterface; use school\childbirthbundle\entity\datachapter;  class datachapteradmin extends admin {  protected function configureshowfields(showmapper $showmapper) { $showmapper     ->add('name')     ->add('status') ; }    sonata.admin.data_chapter: class: school\childbirthbundle\admin\datachapteradmin tags:     - { name: sonata.admin, manager_type: orm, group: "content", label: "chapter" } arguments:      - ~     - school\childbirthbundle\entity\datachapter     - ~     - @doctrine.orm.default_entity_manager calls:     - [ settranslationdomain, [schoolchildbirthbundle]]

and entity looks this

namespace school\childbirthbundle\entity;  use doctrine\orm\mapping orm;  /**  * @orm\entity  * @orm\table(name="data_chapter")   */   class datachapter    {     /**    * @orm\column(type="integer")     * @orm\id    * @orm\generatedvalue(strategy="auto")    */     protected $id;    /**     * @orm\column(type="string", length=255)     */    protected $name;     /**    * @orm\column(type="integer", length=1)     */     protected $status;      /**     * @orm\column(type="integer")      */   protected $idsubject;  }

i dont know im doing wrong

no entity manager defined class school\childbirthbundle\entity\datachapter 500 internal server error - runtimeexception 

 in vendor/sonata-project/doctrine-orm-admin-bundle/model/modelmanager.php @ line 223  -              $em = $this->registry->getmanagerforclass($class);             if (!$em) {                 throw new \runtimeexception(sprintf('no entity manager defined class %s', $class));             }             $this->cache[$class] = $em;

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