php - Hello Expected argument of type "string", "bundle\FrontBundle\Form\Type\PrestationType" given -

i test application , i'm error please

my formtype

namespace bundle\frontbundle\form\type;    use doctrine\orm\entityrepository; use symfony\component\form\abstracttype; use symfony\component\form\formbuilderinterface; use symfony\component\optionsresolver\optionsresolver;  class prestationtype extends abstracttype {     public function buildform(formbuilderinterface $builder, array $options)     {             $builder                 ->add('path')                 ->add('alt')                 ->add('save', 'submit');     }      public function configureoptions(optionsresolver $resolver)     {         $resolver->setdefaults(array(              'data_class' => 'bundle\frontbundle\entity\image',          ));      }      public function getname()     {         return 'prestation';     } } 

my entity

<?php  namespace bundle\frontbundle\entity;  use doctrine\orm\mapping orm;  /**  * image  *  * @orm\table(name="image")  * @orm\entity(repositoryclass="bundle\frontbundle\repository\imagerepository")  */ class image {     /**      * @var int      *      * @orm\column(name="id", type="integer")      * @orm\id      * @orm\generatedvalue(strategy="auto")      */     protected $id;      /**      * @var string      *      * @orm\column(name="path", type="string", length=255)      */     protected $path;      /**      * @var string      *      * @orm\column(name="alt", type="string", length=255)      */     protected $alt;       /**      * id      *      * @return int      */     public function getid()     {         return $this->id;     }   } 

my controller

<?php  namespace bundle\frontbundle\controller;   use bundle\frontbundle\entity\image; use bundle\frontbundle\entity\prestation; use bundle\frontbundle\form\type\prestationtype; use symfony\bundle\frameworkbundle\controller\controller; use symfony\component\httpfoundation\request;  class frontcontroller extends controller {     public function indexaction(request $request)     {           $form = $this->createform(new prestationtype());          $form->handlerequest($request);          return $this->render('frontbundle::index.html.twig', array('form' => $form->createview()));     }       public function listaction()     {          return $this->render('frontbundle:pages:list.html.twig');     } } 

and output error

expected argument of type "string", "bundle\frontbundle\form\type\prestationtype" given

and stack trace

[1] symfony\component\form\exception\unexpectedtypeexception: expected argument of type "string", "bundle\frontbundle\form\type\prestationtype" given @ n/a in /users/sylva/garage/vendor/symfony/symfony/src/symfony/component/form/formfactory.php line 64

at symfony\component\form\formfactory->createbuilder(object(prestationtype), 

null, array()) in /users/sylva/garage/vendor/symfony/symfony/src/symfony/component/form/formfactory.php line 39

at symfony\component\form\formfactory->create(object(prestationtype), 

null, array()) in /users/sylva/garage/vendor/symfony/symfony/src/symfony/bundle/frameworkbundle/controller/controller.php line 285

at symfony\bundle\frameworkbundle\controller\controller->createform(object(prestationtype))     in /users/sylva/garage/src/bundle/frontbundle/controller/frontcontroller.php 

line 19

at bundle\frontbundle\controller\frontcontroller->indexaction(object(request))     in  line   @ call_user_func_array(array(object(frontcontroller), 'indexaction'), array(object(request)))     in /users/sylva/garage/vendor/symfony/symfony/src/symfony/component/httpkernel/httpkernel.php 

line 139

at symfony\component\httpkernel\httpkernel->handleraw(object(request), 

'1') in /users/sylva/garage/vendor/symfony/symfony/src/symfony/component/httpkernel/httpkernel.php line 62

at symfony\component\httpkernel\httpkernel->handle(object(request), '1', 

true) in /users/sylva/garage/vendor/symfony/symfony/src/symfony/component/httpkernel/kernel.php line 169

at symfony\component\httpkernel\kernel->handle(object(request))     in /users/sylva/garage/web/app_dev.php line 30 

thanx guy

$this->createform() expects first argument class name of form want instantiate.

replace:

$form = $this->createform(new prestationtype()); 

with

// php 5.5+ $form = $this->createform(prestationtype::class); // older versions $form = $this->createform('bundle\frontbundle\form\type\prestationtype');