I was trying to import this CD from FreeDB:
http://musicbrainz.org/freedb/folk/5b114219

I filled the "Release Information" and the error below appeared when I clicked in "Next"

Here is the error message:
Internal Server Error

Oops, something went wrong!

Error:

Caught exception in MusicBrainz::Server::Controller::ReleaseEditor::Add->add "malformed UTF-8 character in JSON string, at character offset 93 (before "\x

aria?","arti...") at lib/MusicBrainz/Server/Wizard/ReleaseEditor/Add.pm line 83."

Stack trace:

line 85 MusicBrainz::Server::Wizard::ReleaseEditor::Add
line 132 MusicBrainz::Server::Wizard::ReleaseEditor::Add
line 88 MusicBrainz::Server::Wizard
line 401 MusicBrainz::Server::Wizard
line 132 MusicBrainz::Server::Wizard
line 92 MusicBrainz::Server::Wizard::ReleaseEditor
line 23 MusicBrainz::Server::Controller::ReleaseEditor::Add
line 322 MusicBrainz::Server
line 322 MusicBrainz::Server
line 322 MusicBrainz::Server
line 286 MusicBrainz::Server

Request data:

$VAR1 = {
'query_parameters' => {},
'body_parameters' => {
'artist_credit.names.0.name' => 'Carmen Miranda',
'packaging_id' => '',
'next' => "Next \x

",
'date.month' => '',
'release_group_id' => '',
'labels.0.catalog_number' => '',
'wizard_page_id' => '0',
'release_group.name' => '',
'artist_credit.names.0.artist.id' => '98374',
'labels.0.deleted' => '0',
'country_id' => '',
'primary_type_id' => '',
'labels.0.name' => 'EMI Music Brazil',
'date.year' => '',
'id' => '',
'script_id' => '',
'status_id' => '',
'date.day' => '',
'name' => 'Carmen Miranda 1935-1940, Volume 4',
'barcode' => '',
'artist_credit.names.0.join_phrase' => '',
'labels.0.label_id' => '3882',
'wizard_session_id' => '49644',
'language_id' => '',
'comment' => '',
'gc-mode' => 'English',
'artist_credit.names.0.artist.name' => 'Carmen Miranda',
'annotation' => ''
}
};