'TypeError: sum() takes no keyword arguments' when importing singletons

[j-peeters]

I'm trying to import a folder of singletons but run into a
TypeError: sum() takes no keyword arguments error after which Beets stops.
What is causing this error? Thanks for any ideas.

This is my (verbose, yes this time I didn't forget it ;-)) output:

beet -v import -s /Volumes/BandBuddy/DJ\ Music/80s 
user configuration: /Users/jpeeters/.config/beets/config.yaml
data directory: /Users/jpeeters/.config/beets
plugin paths: /Users/jpeeters/Documents/BeetsPluginDescribe/beetsplug
/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/beets/util/confit.py:21: UserWarning: beets.util.confit is deprecated; use confuse instead
  warnings.warn("beets.util.confit is deprecated; use confuse instead")
Sending event: pluginload
inline: adding item field multidisc
inline: adding item field my_samplerate
inline: adding item field is_flac
inline: adding album field format
inline: adding album field av_bitrate
inline: adding album field album_bitdepth
inline: adding album field album_samplerate
inline: adding album field is_1644
rewrite: adding template field artist Dunderhead - Tom Jenkinson
library database: /Users/jpeeters/Music/Beets/musiclibrary.db
library directory: /Volumes/Tunez
Sending event: library_opened
Sending event: import_begin
ignoring b'.DS_Store' due to ignore rule b'.*'
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.7/bin/beet", line 11, in <module>
    load_entry_point('beets==1.5.0', 'console_scripts', 'beet')()
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/beets/ui/__init__.py", line 1291, in main
    _raw_main(args)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/beets/ui/__init__.py", line 1278, in _raw_main
    subcommand.func(lib, suboptions, subargs)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/beets/ui/commands.py", line 973, in import_func
    import_files(lib, paths, query)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/beets/ui/commands.py", line 943, in import_files
    session.run()
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/beets/importer.py", line 341, in run
    pl.run_parallel(QUEUE_SIZE)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/beets/util/pipeline.py", line 442, in run_parallel
    six.reraise(exc_info[0], exc_info[1], exc_info[2])
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/six.py", line 693, in reraise
    raise value
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/beets/util/pipeline.py", line 259, in run
    msg = next(self.coro)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/beets/importer.py", line 1320, in read_tasks
    for t in task_factory.tasks():
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/beets/importer.py", line 1138, in tasks
    tasks = self._create(self.singleton(path))
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/beets/importer.py", line 1199, in singleton
    item = self.read_item(path)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/beets/importer.py", line 1273, in read_item
    return library.Item.from_path(path)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/beets/library.py", line 603, in from_path
    i.read(path)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/beets/library.py", line 710, in read
    value = getattr(mediafile, key)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/mediafile.py", line 1276, in __get__
    out = style.get(mediafile.mgfile)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/mediafile.py", line 612, in get
    return self.get_list(mutagen_file)[0]
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/mediafile.py", line 619, in get_list
    return [self.deserialize(item) for item in self.fetch(mutagen_file)]
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/mediafile.py", line 951, in fetch
    return sum([el.split('/') for el in frame.text], start=[])
TypeError: sum() takes no keyword arguments

My config.yaml is like this:

library: ~/Music/Beets/musiclibrary.db
directory: /Volumes/Tunez


import:
    write: yes
    copy: yes
    move: no
    link: no
    hardlink: no
    delete: no
    resume: ask
    incremental: no
    incremental_skip_later: no
    from_scratch: no
    quiet_fallback: skip
    none_rec_action: ask
    timid: no
    log:
    autotag: yes
    quiet: no
    singletons: no
    default_action: apply
    languages: []
    detail: no
    flat: no
    group_albums: no
    pretend: false
    search_ids: []
    duplicate_action: remove
    bell: no
    set_fields: {}

clutter: ["Thumbs.DB", ".DS_Store"]
ignore: [".*", "*~", "System Volume Information", "lost+found"]
ignore_hidden: yes

replace:
    '[\\/]': '-'
    '^\.': ''
    '[\x00-\x1f]': '-'
    '[<>:"\?\*\|]': ''
    '\.$': ''
    '\s+$': ''
    '^\s+': ''
    '^-': '-'
path_sep_replace: _
asciify_paths: false
art_filename: cover
max_filename_length: 0

aunique:
    keys: albumartist album
    disambiguators: albumtype year samplerate label catalognum albumdisambig releasegroupdisambig
    bracket: '()'

plugins: 
    - inline
    - the
    - rewrite
    - lastgenre
    - discogs
    - fromfilename
    - fetchart
    - embedart
    - ftintitle
    - edit
    - info
    - missing
    - types
    - convert
    - plexupdate
    - web
    - mbsync
    - fuzzy
    - spotify
    - describe
    - bpmanalyser
    - zero
    - acousticbrainz
    - chroma
#    - unimported
#    - lyrics
#    - smartplaylist
#    - goingrunning
pluginpath: 
    - /Users/jpeeters/Documents/BeetsPluginDescribe/beetsplug
threaded: yes
timeout: 5.0
per_disc_numbering: no
verbose: 0
terminal_encoding:
original_date: no
artist_credit: no
id3v23: no
va_name: "Various Artists"

zero:
    fields: comments
    update_database: true

# Inline plugin template
item_fields:
  multidisc: 1 if disctotal > 1 else 0
  my_samplerate: round(samplerate / 1000)
  is_flac: 1 if format == "FLAC" else 0
album_fields:  
  format: |
       formatList = []
       for item in items:
           formatList.append(item.format)
       return formatList
  av_bitrate: |
       total = 0
       for item in items:
           total += item.bitrate
       return round(total / len(items) / 1000)
  album_bitdepth:  |
       total = 0
       for item in items:
           total += item.bitdepth
       return round(total / len(items))
  album_samplerate:  |
       total = 0
       for item in items:
           total += item.samplerate
       return round(total / len(items) / 1000)
  is_1644: |
       bd = 0
       sr = 0
       br = 0
       for item in items:
           bd += item.bitdepth
           sr += item.samplerate
           br += item.bitrate
       bd = round(bd / len(items))
       sr = round(sr / len(items) / 1000)
       br = round(br / len(items) / 1000)
       return 1 if bd == 16 and sr == 44 and br > 320 else 0

ui:
    terminal_width: 80
    length_diff_thresh: 10.0
    color: yes
    colors:
        text_success: green
        text_warning: yellow
        text_error: red
        text_highlight: red
        text_highlight_minor: lightgray
        action_default: turquoise
        action: blue

format_item: $artist - $album - $title
format_album: $albumartist - $album
time_format: '%Y-%m-%d %H:%M:%S'
format_raw_length: no

sort_album: albumartist+ album+
sort_item: artist+ album+ disc+ track+
sort_case_insensitive: yes

paths:
#  default: 'Albums/%the{$albumartist}/$album (%if{$original_year,$original_year}) %aunique{albumartist album year, albumdisambig}%if{$albumdisambig,($albumdisambig $year) }%if{$is_1644,,%if{$is_flac,($format $bitdepth-$album_samplerate),($format $av_bitrate)}}/%if{$multidisc,$disc-}$track - $title'
  default: 'Albums/%the{$albumartist}/%if{$original_year,$original_year} - $album %aunique{albumartist album year, albumdisambig}%if{$albumdisambig,($albumdisambig $year) }%if{$is_1644,,%if{$is_flac,($format $album_bitdepth-$album_samplerate),($format $av_bitrate)}}/%if{$multidisc,$disc-}$track - $title'
  dancetrack:1: 'Singles Dance/$artist - $title (%if{$original_year,$original_year}) %aunique{albumartist album year, albumtype label catalognum albumdisambig}%if{$albumdisambig,($albumdisambig$ $year)}($bpm bpm)'
  artistsingles:1: 'Albums/%the{$albumartist}/$album/$title'
  custcomp:1: 'Compilations/$album/$track - $artist - $title'
  custcompmin:1: 'Compilations/$album/$artist - $title'
#  singleton: 'Singles/$artist - $title %aunique{albumartist album year, albumtype label catalognum albumdisambig}%if{$albumdisambig,($albumdisambig$ $year)}'
  singleton: '/Volumes/BandBuddy/DJ/$genre/$artist - $title'
  comp: 'Albums/%the{$albumartist}/$album (%if{$original_year,$original_year}) %aunique{albumartist album year, albumtype label catalognum albumdisambig}%if{$albumdisambig,($albumdisambig $year) }%if{$is_1644,,%if{$is_flac,($format $bitdepth-$album_samplerate),($format $av_bitrate)}}/%if{$multidisc,$disc-}$track - $artist - $title'


statefile: state.pickle

musicbrainz:
    host: musicbrainz.org
    ratelimit: 1
    ratelimit_interval: 1.0
    searchlimit: 5

match:
    strong_rec_thresh: 0.04
    medium_rec_thresh: 0.25
    rec_gap_thresh: 0.25
    max_rec:
        missing_tracks: medium
        unmatched_tracks: medium
    distance_weights:
        source: 2.0
        artist: 3.0
        album: 3.0
        media: 1.0
        mediums: 1.0
        year: 1.0
        country: 0.5
        label: 0.5
        catalognum: 0.5
        albumdisambig: 0.5
        album_id: 5.0
        tracks: 2.0
        missing_tracks: 0.9
        unmatched_tracks: 0.6
        track_title: 3.0
        track_artist: 2.0
        track_index: 1.0
        track_length: 2.0
        track_id: 5.0
    preferred:
        countries: []
        media: ['Digital Media|File' , 'CD']
        original_year: no
    ignored: []
    required: []
    ignored_media: []
    ignore_data_tracks: yes
    ignore_video_tracks: yes
    track_length_grace: 10
    track_length_max: 30
    
chroma:
    auto: yes
    
fetchart:
    auto: yes
    cautious: no
    cover_names: cover front art album folder
    minwidth: 290
    maxwidth: 1050
    sources: itunes amazon albumart lastfm fanart filesystem coverart 
    fanarttv_key: f923f8140fa18e02f2de4383519d09a
    lastfm_key: 7d14bd52e3d6fa9937d329eeea4fa2e2
    
acoustid: 
    apikey: VqzdnliViG
   
embedart:
    auto: yes
    ifempty: no   
    
lastgenre:
    auto: yes
    canonical: no
    count: 1
    force: yes
    source: album
    whitelist: yes
    min_weight: 10
    fallback:
    separator: ', '
    prefer_specific: no
    
types:
    av_bitrate: int
    my_samplerate: int
    bitdepth: int
    album_bitdepth: int
    album_samplerate: int
    rating: int
    
convert:
    dest: ~/Music/BeetExports
    format: mp3
    formats: 
        mp3:
            command: ffmpeg -i $source -y -vn -aq 0 $dest
            extension: mp3
        flac:
            command: ffmpeg -i $source -y -vn -acodec flac -sample_fmt s16 -ar 44100 $dest
            extension: flac
    never_convert_lossy_files: yes

plex:
    host: localhost
    port: 32400
    token: 4DupXNf2WUrFe7xcQGzW
    
lastfm:
    user: janpeeters
    
smartplaylist:
    playlist_dir: /Users/Shared/Music/Playlists
    auto: no
    playlists:
        - name: 'favorites.m3u' 
          query: rating:4..5
        - name: 'danceable.m3u'
          query: 
            - danceable:0.8..
        - name: 'acoustic.m3u'
          query: 
            - mood_acoustic:0.8..
        - name: 'aggresive.m3u'
          query: 
            - mood_aggresive:0.8..
        - name: 'electronic.m3u'
          query: 
            - mood_electronic:0.8..
        - name: 'danceable.m3u'
          query: 
            - danceable:0.8..
        - name: 'happy.m3u'
          query: 
            - mood_happy:0.8..           
        - name: 'party.m3u'
          query: 
            - mood_party:0.8.. 
        - name: 'relaxed.m3u'
          query: 
            - mood_relaxed:0.8..                   
        - name: 'sad.m3u'
          query: 
            - mood_sad:0.8..

spotify:
    mode: list
    show_failures: on
    tiebreak: first
    
bpmanalyser:
    auto: no
    dry-run: no
    write: yes
    force: no
    quiet: no
    
goingrunning:
  targets:
    subsonic_m3u:
      device_root: /Users/Shared/Music/Playlists
      device_path: 
      clean_target: yes
      generate_playlist: yes
      copy_files: no
  trainings:
    10K:
      use_flavours: [intensity_low, intensity_high, running]
      duration: 180
      target: subsonic_m3u
  flavours:
    intensity_low:
      bpm: 87..88
    intensity_high:
      bpm: 175..177
    running:
      genre: [electronic, hip hop, funk, trip hop, house]

web:
    host: 0.0.0.0
    cors: 'http://localhost:3000'
    
lyrics:
    auto: yes
    
unimported:
    ignore_extensions: mid wav
    ignore_subdirectories: 
        - "Albums (niet geimporteerd)" 
        - Compilations
        - "Compilations (niet geimporteerd)"
        - "DJ\ Music"
        - "SD3 SDX Expanded"
        - Singles
        - "Singles Dance"
        - "Tunez Uitzoeken"
        - Unsorted
    
rewrite:
    artist Dunderhead - Tom Jenkinson: Squarepusher

[sampsyo]

This was a regression in MediaFile that has since been fixed. beetbox/mediafile#56

[j-peeters]

Thanks @sampsyo. When will this be a part of the release version of Beets? I didn't succeed in installing the 'editable' version of beets so to use this I guess I'm reliant on the release version? Or can I upgrade mediafile in another way?

[wisp3rwind]

mediafile is independent of beets and has seen a release since, depending on how you installed beets, you'll probably need to update it through pip or you package manager.

[j-peeters]

Thanks for your fast answers @wisp3rwind that's great news.