always get the following error:

Error:

Caught exception in MusicBrainz::Server::Controller::Area->add_alias "Can't locate object method "parent_id" via package "MusicBrainz::Server::Entity::Area" at lib/MusicBrainz/Server/Data/Role/OptionsTree.pm line 26."
Stack trace:
line 26 MusicBrainz::Server::Data::Role::OptionsTree
line 113 MusicBrainz::Server::Form::Utils
line 98 MusicBrainz::Server::Form::Alias
line 237 MusicBrainz::Server
line 175 MusicBrainz::Server::Controller
line 63 MusicBrainz::Server::Controller::Role::EditRelationships
line 81 MusicBrainz::Server::Controller::Role::Alias
line 341 MusicBrainz::Server
line 315 MusicBrainz::Server
line 342 MusicBrainz::Server
line 356 MusicBrainz::Server
line 388 MusicBrainz::Server
Time: 2016-11-14 06:42:40 UTC

Host: cf41528c4ed3

Interface language: en

URL: https://beta.musicbrainz.org/area/c08b64a7-35a0-4ef4-b94c-7db349463d3a/add-alias

Request data:

$VAR1 = {
'body_parameters' => {},
'query_parameters' => {}
};