Symfony2中未定義指數編輯/刪除實體「團隊」與FOS用戶

我已成立了一個Symfony2的項目，索納塔和FOS用戶捆綁安裝時Symfony2中未定義指數編輯/刪除實體「團隊」與FOS用戶

我產生延伸BaseUser一個自定義的用戶類。這是一個摘錄：

namespace Application\Sonata\UserBundle\Entity; 

use Sonata\UserBundle\Entity\BaseUser as BaseUser; 
use Doctrine\ORM\Mapping as ORM; 

class User extends BaseUser { 
    .. 
    /** 
    * @ORM\ManyToOne(targetEntity="MyProject\UserBundle\Entity\Team", inversedBy="members") 
    * @ORM\JoinColumn(type="integer", name="team_id", referencedColumnName="id", nullable=true) 
    */ 
    protected $team; 

    public function setTeam(\MyProject\UserBundle\Entity\Team $team) 
    { 
    $this->team = $team; 
    } 

    public function getTeam() 
    { 
    return $this->team; 
    }

我也有一個實體的「團隊」，可以容納一些用戶。這是一個摘錄：

class Team { 
    /** 
    * @ORM\OneToMany(targetEntity="Application\Sonata\UserBundle\Entity\User", mappedBy="team") 
    */ 

    protected $members; 

    public function setMembers(\Doctrine\Common\Collections\ArrayCollection $members) 
    { 
    $this->members = $members; 
    } 

    public function getMembers() 
    { 
    return $this->members; 
    }

我使用Sonata Admin軟件包來執行基本的CRUD。創建了一支具有一些用戶是沒有問題的

<?php 
class TeamAdmin extends Admin { 
    protected function configureFormFields(FormMapper $formMapper) 
    { 
    $formMapper 

     ->add('members', 'entity', array(
       'required' => FALSE, 
       'class' => 'ApplicationSonataUserBundle:User', 
       'property' => 'username', 
       'label' => 'Team members', 
       'multiple' => TRUE, 
      )) 
    ; 
    }

當我進入一隊的編輯畫面，或刪除時，問題上升。