ChangeObjectDialog unbound method get_verbose_name() must be called with Admin instance as first argument (got nothing instead)

[Juan Diego Bracamonte]

Hello. I'm trying to use ChangeObjectDialog class and I have an error...

I have a simple class

class Parametro(Entity):

    using_options(tablename = 'parametro')

    nombre = Field(Unicode(64), required=True, unique=True)

    valor = Field(Text)

    descripcion = Field(Unicode(255))

    def __unicode__(self):

        return unicode(self.nombre)

    @property

    def note(self):

        pass

    class Admin(EntityAdmin):

        verbose_name = 'Parametro'

        verbose_name_plural  = 'Parametros'

        list_display  = ['nombre', 'valor', 'descripcion']

        list_search = ['nombre']

        confirm_delete = True

        

        form_display  = GroupBoxForm('', ['nombre', 'descripcion', 'valor'])

        form_display = VBoxForm([WidgetOnlyForm('note'), form_display])

        list_filter = [EditorFilter('nombre', 'Parametro', like_op)]

        form_actions = [actions.action_steps.ModificarParametros()]

        

        field_attributes = dict(note = {'delegate':delegates.NoteDelegate}, 

                                nombre = {'minimal_column_width':40},

                                valor = {'minimal_column_width':50, 'delegate':delegates.TextEditDelegate, 'editable': True},

                                descripcion = {'minimal_column_width':80},

                                )

In an Action I want to execute this code

class ModificarParametros(Action):

    verbose_name = u"Modificar Parametros"

    tooltip = u"Crear Contacto"

    perm_required = ["administrativo"]

                        

    def model_run( self, model_context ):

        

        parametro = model_context.get_object()

        

        obj = yield ChangeObjectDialog(parametro, parametro.Admin)

Error...

  File "C:\python27\lib\site-packages\camelot\view\action_steps\change_object.py", line 65, in __init__

    self.setWindowTitle( admin.get_verbose_name() )

TypeError: unbound method get_verbose_name() must be called with Admin instance as first argument (got nothing instead)

Can you help me?

Thanks!