object_recognition_reconstruction from ORK crashes

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Hi, I want to test the object recognition tool-chain presented on

http://wg-perception.github.io/object...

Unfourtunatly I got the following error message while running mesh operation

    rosrun object_recognition_reconstruction mesh_object --all --visualize --commit
   Traceback (most recent call last):
              File "/opt/ros/hydro/lib/object_recognition_reconstruction/mesh_object", line 186, in <module>
              simple_mesh_session(dbs, session, args)
             File "/opt/ros/hydro/lib/object_recognition_reconstruction/mesh_object", line 86, in simple_mesh_session
             observation_dealer = ecto.Dealer(tendril=db_reader.inputs.at('document'),               
            iterable=Documents(ObjectDb(db_params), obs_ids))
   TypeError: No registered converter was able to produce a C++ rvalue of type std::string from this Python object of   
   type unicode

Any idea? Thanks for your help!

Sebastian