bulkloader_error.txt

[ERROR   ] [WorkerThread-0] WorkerThread:
Traceback (most recent call last):
  File "/home/eighty/Dropbox/projects/lib/python/google_appengine/google/appengine/tools/adaptive_thread_pool.py", line 176, in WorkOnItems
    status, instruction = item.PerformWork(self.__thread_pool)
  File "/home/eighty/Dropbox/projects/lib/python/google_appengine/google/appengine/tools/bulkloader.py", line 764, in PerformWork
    transfer_time = self._TransferItem(thread_pool)
  File "/home/eighty/Dropbox/projects/lib/python/google_appengine/google/appengine/tools/bulkloader.py", line 933, in _TransferItem
    self.content = self.request_manager.EncodeContent(self.rows)
  File "/home/eighty/Dropbox/projects/lib/python/google_appengine/google/appengine/tools/bulkloader.py", line 1392, in EncodeContent
    entity = loader.create_entity(values, key_name=key, parent=parent)
  File "/home/eighty/Dropbox/projects/lib/python/google_appengine/google/appengine/ext/bulkload/bulkloader_config.py", line 445, in create_entity
    entity = self.dict_to_entity(input_dict, self.bulkload_state)
  File "/home/eighty/Dropbox/projects/lib/python/google_appengine/google/appengine/ext/bulkload/bulkloader_config.py", line 147, in dict_to_entity
    self.__run_import_transforms(input_dict, instance, bulkload_state_copy)
  File "/home/eighty/Dropbox/projects/lib/python/google_appengine/google/appengine/ext/bulkload/bulkloader_config.py", line 258, in __run_import_transforms
    instance[transform.property] = value
  File "/home/eighty/Dropbox/projects/lib/python/google_appengine/google/appengine/api/datastore.py", line 713, in __setitem__
    datastore_types.ValidateProperty(name, value)
  File "/home/eighty/Dropbox/projects/lib/python/google_appengine/google/appengine/api/datastore_types.py", line 1451, in ValidateProperty
    'Unsupported type for property %s: %s' % (name, v.__class__))
BadValueError: Unsupported type for property polygons: <class 'mol.db.LayerPolygon'>