Object recognition: FailedFromPythonConversion exception on db [closed]

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I am trying to get the object_recognition stack working on ros electric, I am using ubuntu 10.04 and ros packages based installation. After capture and database uploading of a model I tried testing the detection with the tabletop approach. After some tuning I managed to get to the point where is trying to reach the objects from the db. But I got stuck with this error:

<object_recognition_core.boost.interface.ObjectDb object at 0xa8eb324>
tendrils:
    db [object_recognition_core::db::ObjectDb]
    object_ids [std::string]

object_ids
['deac36880abc636d8654728b0a000651']
Traceback (most recent call last):
  File "object_recognition_core/bin/detection", line 9, in <module>
    plasm = create_detection_plasm()
  File "/opt/ros/electric/stacks/object_recognition/object_recognition_core/lib/python2.6/dist-packages/object_recognition_core/pipelines/plasm.py", line 54, in create_detection_plasm
    pipeline_cells[pipeline_id] = pipeline.detector(**pipeline_param)
  File "/opt/ros/electric/stacks/object_recognition/object_recognition_core/lib/python2.6/dist-packages/object_recognition_tabletop/detector.py", line 106, in detector
    db=object_db)
  File "/opt/ros/electric/stacks/object_recognition/object_recognition_core/lib/python2.6/dist-packages/ecto/__init__.py", line 70, in impl

    setattr(self.params, k, v)
ecto.FailedFromPythonConversion:            exception_type  FailedFromPythonConversion

            cpp_typename  std::string
            pyobject_repr  ['deac36880abc636d8654728b0a000651']

It seems that something's wrong with the object id at the db but couldn't figure out what. For more info here is the config file I'm using:

source1:
  type: ros_kinect
  rgb_frame_id: '/camera_rgb_optical_frame'

sink1:
  type: table_publisher
  package: 'object_recognition_tabletop'

pipeline1:
  method: 'tabletop_table'
  package: 'object_recognition_tabletop'
  submethod: ''
  sources: [source1]
  sinks: [sink1]
  parameters: {}

sink2:
  type: publisher
  object_ids: 'all'

pipeline2:
  method: 'tabletop_object'
  package: 'object_recognition_tabletop'
  submethod: ''
  sources: [source1, pipeline1]
  sinks: [sink2]
  parameters:
    object_ids: 'all'
    db:
      type: 'CouchDB'
      root: 'http://localhost:5984'
      collection: 'object_recognition'

Any hint on the issue is more than welcome.

Thanks in advance.