Running app:prepopulate command fails

(env)rafal@MacBook-Pro-Rafa ~/Documents/Projects/superdesk/server (master)*$ python3 manage.py app:prepopulate
abstract_populator
currency
currency_base
currency_usd_to_cad
dollar_AUD_character_replace
dpa_derive_dateline
noise11_derive_metadata
reuters_derive_dateline
take_key_validator
update_to_pass_validation
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pushing event activity ({"_dest": []})
pushing event activity ({"_dest": []})
pushing event activity ({"_dest": []})
pushing event activity ({"_dest": []})
pushing event activity ({"_dest": []})
pushing event activity ({"_dest": []})
pushing event stage ({"desk_id": "None", "stage_id": "56b4ae46b7cb18e7f3747418", "updated": 1})
pushing event stage ({"desk_id": "None", "stage_id": "56b4ae46b7cb18e7f3747419", "updated": 1})
pushing event desk ({"created": 1, "desk_id": "56b4ae46b7cb18e7f374741a"})
pushing event stage ({"desk_id": "None", "stage_id": "56b4ae46b7cb18e7f374741b", "updated": 1})
pushing event stage ({"desk_id": "None", "stage_id": "56b4ae46b7cb18e7f374741c", "updated": 1})
pushing event desk ({"created": 1, "desk_id": "56b4ae46b7cb18e7f374741d"})
pushing event stage ({"created": 1, "desk_id": "56b4ae46b7cb18e7f374741a", "is_visible": true, "stage_id": "56b4ae46b7cb18e7f374741e"})
pushing event stage ({"created": 1, "desk_id": "56b4ae46b7cb18e7f374741a", "is_visible": true, "stage_id": "56b4ae46b7cb18e7f374741f"})
pushing event stage ({"created": 1, "desk_id": "56b4ae46b7cb18e7f374741a", "is_visible": true, "stage_id": "56b4ae46b7cb18e7f3747420"})
pushing event stage ({"created": 1, "desk_id": "56b4ae46b7cb18e7f374741d", "is_visible": true, "stage_id": "56b4ae46b7cb18e7f3747421"})
pushing event stage ({"created": 1, "desk_id": "56b4ae46b7cb18e7f374741d", "is_visible": true, "stage_id": "56b4ae46b7cb18e7f3747422"})
pushing event stage ({"created": 1, "desk_id": "56b4ae46b7cb18e7f374741d", "is_visible": true, "stage_id": "56b4ae46b7cb18e7f3747423"})
PUT /superdesk/archive/item1 [status:400 request:0.079s]
Uhoh, an exception occured while running the command...
TransportError(400, 'illegal_argument_exception')
Traceback (most recent call last):
  File "/Users/rafal/Documents/Projects/superdesk/server/env/lib/python3.5/site-packages/superdesk/__init__.py", line 56, in __call__
    res = self.run(*args, **kwargs)
  File "/Users/rafal/Documents/Projects/superdesk/server/env/lib/python3.5/site-packages/apps/prepopulate/app_prepopulate.py", line 174, in run
    prepopulate_data(prepopulate_file, get_default_user())
  File "/Users/rafal/Documents/Projects/superdesk/server/env/lib/python3.5/site-packages/apps/prepopulate/app_prepopulate.py", line 80, in prepopulate_data
    ids = service.post([data])
  File "/Users/rafal/Documents/Projects/superdesk/server/env/lib/python3.5/site-packages/superdesk/services.py", line 110, in post
    ids = self.create(docs, **kwargs)
  File "/Users/rafal/Documents/Projects/superdesk/server/env/lib/python3.5/site-packages/superdesk/services.py", line 63, in create
    ids = self.backend.create(self.datasource, docs, **kwargs)
  File "/Users/rafal/Documents/Projects/superdesk/server/env/lib/python3.5/site-packages/superdesk/eve_backend.py", line 80, in create
    self.create_in_search(endpoint_name, docs, **kwargs)
  File "/Users/rafal/Documents/Projects/superdesk/server/env/lib/python3.5/site-packages/superdesk/eve_backend.py", line 95, in create_in_search
    search_backend.insert(endpoint_name, docs, **kwargs)
  File "/Users/rafal/Documents/Projects/superdesk/server/env/lib/python3.5/site-packages/eve_elastic/elastic.py", line 365, in insert
    res = self.es.index(body=doc, id=doc.get('_id'), **kwargs)
  File "/Users/rafal/Documents/Projects/superdesk/server/env/lib/python3.5/site-packages/elasticsearch/client/utils.py", line 69, in _wrapped
    return func(*args, params=params, **kwargs)
  File "/Users/rafal/Documents/Projects/superdesk/server/env/lib/python3.5/site-packages/elasticsearch/client/__init__.py", line 263, in index
    _make_path(index, doc_type, id), params=params, body=body)
  File "/Users/rafal/Documents/Projects/superdesk/server/env/lib/python3.5/site-packages/elasticsearch/transport.py", line 307, in perform_request
    status, headers, data = connection.perform_request(method, url, params, body, ignore=ignore, timeout=timeout)
  File "/Users/rafal/Documents/Projects/superdesk/server/env/lib/python3.5/site-packages/elasticsearch/connection/http_urllib3.py", line 93, in perform_request
    self._raise_error(response.status, raw_data)
  File "/Users/rafal/Documents/Projects/superdesk/server/env/lib/python3.5/site-packages/elasticsearch/connection/base.py", line 105, in _raise_error
    raise HTTP_EXCEPTIONS.get(status_code, TransportError)(status_code, error_message, additional_info)
elasticsearch.exceptions.RequestError: TransportError(400, 'illegal_argument_exception')