human
Solve the following python programming problem given the following code:
@ gen.coroutine 
def _CreateSaveEpisodeDicts(self) : 
    'Creates a list of dicts describing the source and target episodes of the save. The
    episode dicts passed in the save_photos request are combined with episodes in any of the
    viewpoints passed in the save_photos request. Returns the list.
    ' 
    vp_ep_ids = [] 
    skip_vp_ep_ids = set ((ep_dict ['existing_episode_id'] for ep_dict in self._ep_dicts)) 
    ep_ph_ids = { 
        
} 
    @ gen.coroutine 
    def _VisitPosts(photo_ids, post) : 
        photo_ids.append (post.photo_id) 
@ gen.coroutine 
    def _VisitEpisodeKeys(episode_key) : 
        episode_id = episode_key.hash_key 
        if (episode_id not in skip_vp_ep_ids) : 
            vp_ep_ids.append (episode_id) 
photo_ids = [] 
        (yield gen.Task (Post.VisitRange, self._client, episode_id, None, None, partial (_VisitPosts, photo_ids))) 
        ep_ph_ids [episode_id] = photo_ids 
tasks = [] 
    for viewpoint_id in set (self._viewpoint_ids) : 
        query_expr = ('episode.viewpoint_id={id}', { 
            'id' : viewpoint_id, 
}) 
        tasks.append (gen.Task (Episode.VisitIndexKeys, self._client, query_expr, _VisitEpisodeKeys)) 
(yield tasks) 
    target_ep_ids = (yield ViewfinderOperation._AllocateTargetEpisodeIds (self._client, _VisitPosts._user.user_id, self._user.webapp_dev_id, self._user.private_vp_id, vp_ep_ids)) 
    save_ep_dicts = { 
        
} 
    for (source_ep_id, target_ep_id) in zip (vp_ep_ids, target_ep_ids) : 
        save_ep_dicts [target_ep_id] = { 
            'existing_episode_id' : source_ep_id, 
            'new_episode_id' : target_ep_id, 
            'photo_ids' : ep_ph_ids [source_ep_id], 
} 
for ep_dict in self._ep_dicts : 
        existing_ep_dict = save_ep_dicts.get (ep_dict ['new_episode_id'], None) 
        if (existing_ep_dict is not None) : 
            if (ep_dict ['existing_episode_id'] != existing_ep_dict ['existing_episode_id']) : 
                raise InvalidRequestError (('Cannot save episodes "%s" and "%s" to same target episode...

    
    

    Fix the buggy line: target_ep_ids = (yield ViewfinderOperation._AllocateTargetEpisodeIds (self._client, _VisitPosts._user.user_id, self._user.webapp_dev_id, self._user.private_vp_id, vp_ep_ids))
assistant
#Here is Python program to fix the buggy line: target_ep_ids = (yield ViewfinderOperation.

target_ep_ids = (yield ViewfinderOperation._AllocateTargetEpisodeIds (self._client, self._user.user_id, self._user.webapp_dev_id, self._user.private_vp_id, vp_ep_ids))