jEN - get Artist's genre

Hi. Many buckets (ex. images, songs) are working well except genre.

———— code --------

Artist artist = echoNest.newArtistByID("ARH6W4X1187B99274F"); artist.fetchBucket(“genre"); System.out.println("Artist : " + artist);

———— console ———— Artist : {"id":"ARH6W4X1187B99274F","name":"Radiohead"}

There is no result about genre.But, i search same data in artist profile, in developer api.

———— web url ———— http://developer.echonest.com/api/v4/artist/profile?api_key=ZZKPLNLJYHUVPSMXD&id=ARH6W4X1187B99274F&format=json&bucket=genre

There are genres. It may caused by my misunderstanding. Help me.