update_spotnet error "Post does not have a From header"

[hagst]

Traceback (most recent call last):
  File "\example_project\manage.py", line 8, in <module>    execute_from_command_line(sys.argv)
  File "\django\core\management\__init__.py",line 443,
  in execute_from_command_line
    utility.execute()
  File "\django\core\management\__init__.py",line 382,
  in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "\django\core\management\base.py", line 196,
  in run_from_argv
    self.execute(*args, **options.__dict__)
  File "\django\core\management\base.py", line 232,
  in execute
  output = self.handle(*args, **options)
  File "\spotnet\management\commands\update_spotnet.py", line 42,
  in handle
    conn.update(overwrite, self.logger_function)
  File "\spotnet\connection.py", line 140,
  in update
    self.update_group(group, overwrite=overwrite, logger=lambda x: logger('  %s' % x))
  File "\spotnet\connection.py", line 179,
  in update_group
    logger=lambda x: logger('  %s' % x),
  File "spotnet\connection.py", line 225,
  in
  update_group_postnumbers
    logger=lambda x: logger('  %s' % x),
  File "\django\db\transaction.py", line 209,
  in inner
    return func(*args, **kwargs)
  File "\spotnet\connection.py", line 330,
  in add_post
    snp = Post.from_raw(raw, id=existing_id)
  File "\spotnet\models.py", line 153,
  in from _raw
    poster=raw.poster,
  File "\spotnet\post.py", line 438, in poster

    raise InvalidPost("Post does not have a From header")
spotnet.post.InvalidPost: Post does not have a From header