spotify-downloader: Error when applying metadata: `'albumartist' is not a valid key`

Everything installed correctly.

I try to download a playlist with : python3 spotdl.py --list=the-kajitsu-playlist.txt

and I have this result :

INFO: Preparing to download 47 songs

INFO: 1. After the Heat - Eno & Cluster - The Shade - 1978 (http://www.youtube.com/watch?v=BlSEasigWEQ)
  3,039,737 Bytes [100.00%] received. Rate: [ 365 KB/s].  ETA: [0 secs]    
INFO: Converting Eno Moebius Roedelius - The Shade.m4a to mp3
INFO: Applying metadata
Traceback (most recent call last):
  File "spotdl.py", line 216, in <module>
    main()
  File "spotdl.py", line 198, in main
    download_list(text_file=const.args.list)
  File "spotdl.py", line 83, in download_list
    download_single(raw_song, number=number)
  File "spotdl.py", line 172, in download_single
    metadata.embed(os.path.join(const.args.folder, output_song), meta_tags)
  File "/home/arnauld/Desktop/spotify-downloader/core/metadata.py", line 34, in embed
    return embed.as_mp3()
  File "/home/arnauld/Desktop/spotify-downloader/core/metadata.py", line 57, in as_mp3
    self._embed_basic_metadata(audiofile, preset=TAG_PRESET)
  File "/home/arnauld/Desktop/spotify-downloader/core/metadata.py", line 137, in _embed_basic_metadata
    audiofile[preset['albumartist']] = meta_tags['artists'][0]['name']
  File "/usr/lib/python3/dist-packages/mutagen/easyid3.py", line 212, in __setitem__
    raise EasyID3KeyError("%r is not a valid key" % key)
mutagen.easyid3.EasyID3KeyError: "'albumartist' is not a valid key"

Thank you.