[symfony-users] Delete is not work in admin generator

[saturngod]

I write generator.yml like that

generator:
  class:              sfPropelAdminGenerator

  param:
    model_class:      Photolibrary
    theme:            default

    config:
    list:
      title:  Photo Library Management
      display:  [=username,name,thumbnail_image,date]
      max_per_page:  10
      sort:  [userid,asc]
      filters: [userid,name]
      object_actions:
        _delete: -
      batch_actions:
        _delete: -

      fields:
         username: { name: User Name, params: width=300}
         name: { name: Picture}
         thumbnail_image: {name: Image, type: image_tag}


Delete button appear and but I can't delete it. It show

Action "photolibrary/82" does not exist.

So, How to write for delete ?

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