[emms-help] emms suddenly stopped playing files and starting throwing this error

[A . W .]

Either it does nothing, or throws this:

Debugger entered--Lisp error: (error "Don't know how to play track:
(*track* (type . file) (name .
\"/media/externo/stories/Animate/CCS/[O-A] CardCaptor Sakura - 10
[5A3B8D23].ogm\") (metadata) (info-mtime 18289 63307))")
  signal(error ("Don't know how to play track: (*track* (type . file)
(name . \"/media/externo/stories/Animate/CCS/[O-A] CardCaptor Sakura -
10 [5A3B8D23].ogm\") (metadata) (info-mtime 18289 63307))"))
  error("Don't know how to play track: %S" (*track* (type . file)
(name . "/media/externo/stories/Animate/CCS/[O-A] CardCaptor Sakura -
10 [5A3B8D23].ogm") (metadata) (info-mtime 18289 63307)))
  (if (not player) (error "Don't know how to play track: %S" track)
(let (...) (funcall ... track)))
  (let ((player ...)) (if (not player) (error "Don't know how to play
track: %S" track) (let ... ...)))
  (if emms-player-playing-p (error "A player is already playing") (let
(...) (if ... ... ...)))
  emms-player-start((*track* (type . file) (name .
"/media/externo/stories/Animate/CCS/[O-A] CardCaptor Sakura - 10
[5A3B8D23].ogm") (metadata) (info-mtime 18289 63307)))
  (if emms-player-playing-p nil (emms-player-start
(emms-playlist-current-selected-track)))
  (unless emms-player-playing-p (emms-player-start
(emms-playlist-current-selected-track)))
  emms-start()
  emms-playlist-mode-play-current-track()
  (if (not emms-playlist-mode-open-playlists)
(emms-playlist-mode-play-current-track) (unless
(emms-playlist-track-at) (emms-playlist-next)) (let* (... ... ...) (if
... ... ...)))
  (save-excursion (emms-move-beginning-of-line nil) (if (not
emms-playlist-mode-open-playlists)
(emms-playlist-mode-play-current-track) (unless ... ...) (let* ...
...)))
  emms-playlist-mode-play-smart()
  call-interactively(emms-playlist-mode-play-smart nil nil)

no changes to my .emacs or the like.