human
Solve the following python programming problem given the following code:
@ property 
def filter(self) : 
    user_ids = set (CouchUser.ids_by_domain (_top_level_filter.domain)) 
    user_ids.update (CouchUser.ids_by_domain (self.domain, is_active = False)) 
    user_ids.add ('demo_user') 
    def _top_level_filter(form) : 
        return (form_matches_users (form, user_ids) or is_commconnect_form (form)) 
f = SerializableFunction (_top_level_filter) 
    if (self.app_id is not None) : 
        from corehq.apps.reports import util as reports_util 
        f.add (reports_util.app_export_filter, app_id = self.app_id) 
if (not self.include_errors) : 
        f.add (instances) 
actual = SerializableFunction (default_form_filter, filter = f) 
    return actual 

    
    

    Fix the buggy line: user_ids = set (CouchUser.ids_by_domain (_top_level_filter.domain))
assistant
#Here is Python code to fix the buggy line: user_ids = set (CouchUser.

user_ids = set (CouchUser.ids_by_domain (self.domain))