symfony - Upload profile picture -

i want allow user change profile picture. followed symfony2 documentations, it's working. problem is, can't call form using {{ form_widget(form.file) }} must use {{ form_widget(form) }}. it's annoying because have other value in formbuilder , want able custom every fields in twig.

this formtype.

<?php  namespace l3o1\userbundle\form\type;  use symfony\component\form\abstracttype; use symfony\component\form\formbuilderinterface; use symfony\component\optionsresolver\optionsresolverinterface;  class profilepictureformtype extends abstracttype {     public function buildform(formbuilderinterface $builder, array $options)     {         // add custom field         $builder->add('file', 'file', array(                     'required'=>false))                 /*->add('aboutme', 'textarea', array(                     'attr'=>array(                     'rows'=>4,                     'cols'=>50 ),                     'required'=>false))*/         ;     }      public function setdefaultoptions(optionsresolverinterface $resolver)     {         $resolver->setdefaults(array(             'data_class' => 'l3o1\userbundle\entity\user'         ));     }      public function getname()     {         return 'l3o1_user_profile';     } } 

if have error when try {{ form_widget(form.file) }} share us.

if {{ form_widget(form.file) }} doesnt save file problem must missing token or missing enctype form :

<form id="someid" action="{{somepath}}" method="post" {{ form_enctype(form) }}>      {#your codes#}      {{ form_widget(form._token) }}  </form>