E: 08:09:35,486 webservice._handle_reply:407: Network request error for https://musicbrainz.org:443/ws/2/release/527b489c-6710-4b02-bd97-9ffb8c98fe1e?inc=release-groups+media+discids+recordings+artist-credits+artists+aliases+labels+isrcs+collections+user-collections+artist-rels+release-rels+url-rels+recording-rels+work-rels: Error transferring https://musicbrainz.org:443/ws/2/release/527b489c-6710-4b02-bd97-9ffb8c98fe1e?inc=release-groups+media+discids+recordings+artist-credits+artists+aliases+labels+isrcs+collections+user-collections+artist-rels+release-rels+url-rels+recording-rels+work-rels - server replied: Not Found (QT code 203, HTTP code 404)
E: 08:09:35,489 album.error_append:286: Error transferring https://musicbrainz.org:443/ws/2/release/527b489c-6710-4b02-bd97-9ffb8c98fe1e?inc=release-groups+media+discids+recordings+artist-credits+artists+aliases+labels+isrcs+collections+user-collections+artist-rels+release-rels+url-rels+recording-rels+work-rels - server replied: Not Found
E: 08:09:36,428 util.thread.run:64: Traceback (most recent call last):
  File "./mutagen/_util.py", line 251, in _openfile
    fileobj = open(filename, "rb+" if writable else "rb")
FileNotFoundError: [Errno 2] No such file or directory: b'/media/sf_devel/musicbrainz/picard-test-files/ACDC - Hells Bells.mp3'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "./picard/util/thread.py", line 60, in run
    result = self.func()
  File "./picard/file.py", line 171, in _load_check
    return self._load(filename)
  File "./picard/formats/id3.py", line 259, in _load
    file = self._get_file(encode_filename(filename))
  File "./picard/formats/id3.py", line 682, in _get_file
    return self._File(filename, ID3=compatid3.CompatID3)
  File "./mutagen/_file.py", line 48, in __init__
    self.load(*args, **kwargs)
  File "./mutagen/_util.py", line 155, in wrapper
    writable, create) as h:
  File "/usr/lib/python3.6/contextlib.py", line 81, in __enter__
    return next(self.gen)
  File "./mutagen/_util.py", line 272, in _openfile
    raise MutagenError(e)
mutagen.MutagenError: [Errno 2] No such file or directory: b'/media/sf_devel/musicbrainz/picard-test-files/ACDC - Hells Bells.mp3'

E: 08:09:36,436 file._loading_finished:189: Guessing format of /media/sf_devel/musicbrainz/picard-test-files/ACDC - Hells Bells.mp3 failed
Traceback (most recent call last):
  File "./picard/file.py", line 187, in _loading_finished
    alternative_file = guess_format(self.filename)
  File "./picard/formats/util.py", line 61, in guess_format
    with open(filename, "rb", 0) as fileobj:
FileNotFoundError: [Errno 2] No such file or directory: '/media/sf_devel/musicbrainz/picard-test-files/ACDC - Hells Bells.mp3'
Fatal Python error: Cannot recover from stack overflow.

Thread 0x00007fc494b54700 (most recent call first):
  File "./mutagen/id3/_id3v1.py", line 41 in find_id3v1
  File "./mutagen/id3/_file.py", line 176 in load
  File "./mutagen/_util.py", line 156 in wrapper
  File "./mutagen/_util.py", line 185 in wrapper
  File "./mutagen/_tags.py", line 111 in __init__
  File "./mutagen/_util.py", line 534 in __init__
  File "./mutagen/id3/_tags.py", line 173 in __init__
  File "./mutagen/id3/_file.py", line 77 in __init__
  File "./picard/formats/mutagenext/compatid3.py", line 66 in __init__
  File "./mutagen/id3/_file.py", line 409 in load
  File "./mutagen/_util.py", line 156 in wrapper
  File "./mutagen/_file.py", line 48 in __init__
  File "./picard/formats/id3.py", line 682 in _get_file
  File "./picard/formats/id3.py", line 259 in _load
  File "./picard/file.py", line 171 in _load_check
  File "./picard/util/thread.py", line 60 in run

Current thread 0x00007fc4c31e7740 (most recent call first):
  File "<frozen importlib._bootstrap>", line 174 in _get_module_lock
  File "<frozen importlib._bootstrap>", line 148 in __enter__
  File "<frozen importlib._bootstrap>", line 968 in _find_and_load
  File "/usr/lib/python3.6/email/header.py", line 16 in <module>
  File "<frozen importlib._bootstrap>", line 219 in _call_with_frames_removed
  File "<frozen importlib._bootstrap_external>", line 678 in exec_module
  File "<frozen importlib._bootstrap>", line 665 in _load_unlocked
  File "<frozen importlib._bootstrap>", line 955 in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 971 in _find_and_load
  File "<frozen importlib._bootstrap>", line 219 in _call_with_frames_removed
  File "<frozen importlib._bootstrap>", line 1023 in _handle_fromlist
  File "/usr/lib/python3.6/email/_policybase.py", line 7 in <module>
  File "<frozen importlib._bootstrap>", line 219 in _call_with_frames_removed
  File "<frozen importlib._bootstrap_external>", line 678 in exec_module
  File "<frozen importlib._bootstrap>", line 665 in _load_unlocked
  File "<frozen importlib._bootstrap>", line 955 in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 971 in _find_and_load
  File "/usr/lib/python3.6/email/feedparser.py", line 27 in <module>
  File "<frozen importlib._bootstrap>", line 219 in _call_with_frames_removed
  File "<frozen importlib._bootstrap_external>", line 678 in exec_module
  File "<frozen importlib._bootstrap>", line 665 in _load_unlocked
  File "<frozen importlib._bootstrap>", line 955 in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 971 in _find_and_load
  File "/usr/lib/python3.6/email/parser.py", line 12 in <module>
  File "<frozen importlib._bootstrap>", line 219 in _call_with_frames_removed
  File "<frozen importlib._bootstrap_external>", line 678 in exec_module
  File "<frozen importlib._bootstrap>", line 665 in _load_unlocked
  File "<frozen importlib._bootstrap>", line 955 in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 971 in _find_and_load
  File "/usr/lib/python3.6/http/client.py", line 71 in <module>
  File "<frozen importlib._bootstrap>", line 219 in _call_with_frames_removed
  File "<frozen importlib._bootstrap_external>", line 678 in exec_module
  File "<frozen importlib._bootstrap>", line 665 in _load_unlocked
  File "<frozen importlib._bootstrap>", line 955 in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 971 in _find_and_load
  File "/usr/lib/python3.6/urllib/request.py", line 88 in <module>
  File "<frozen importlib._bootstrap>", line 219 in _call_with_frames_removed
  File "<frozen importlib._bootstrap_external>", line 678 in exec_module
  File "<frozen importlib._bootstrap>", line 665 in _load_unlocked
  File "<frozen importlib._bootstrap>", line 955 in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 971 in _find_and_load
  File "/usr/lib/python3/dist-packages/apport/report.py", line 21 in <module>
  File "<frozen importlib._bootstrap>", line 219 in _call_with_frames_removed
  File "<frozen importlib._bootstrap_external>", line 678 in exec_module
  File "<frozen importlib._bootstrap>", line 665 in _load_unlocked
  File "<frozen importlib._bootstrap>", line 955 in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 971 in _find_and_load
  File "/usr/lib/python3/dist-packages/apport/__init__.py", line 5 in <module>
  File "<frozen importlib._bootstrap>", line 219 in _call_with_frames_removed
  File "<frozen importlib._bootstrap_external>", line 678 in exec_module
  File "<frozen importlib._bootstrap>", line 665 in _load_unlocked
  File "<frozen importlib._bootstrap>", line 955 in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 971 in _find_and_load
  File "<frozen importlib._bootstrap>", line 219 in _call_with_frames_removed
  File "<frozen importlib._bootstrap>", line 941 in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 971 in _find_and_load
  File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 72 in apport_excepthook
  File "./picard/tagger.py", line 473 in move_files
  File "./picard/tagger.py", line 456 in _file_loaded
  File "./picard/file.py", line 218 in _loading_finished
  File "./picard/util/thread.py", line 47 in run
  File "./picard/tagger.py", line 402 in event
  File "./picard/tagger.py", line 473 in move_files
  File "./picard/tagger.py", line 456 in _file_loaded
  File "./picard/file.py", line 218 in _loading_finished
  File "./picard/util/thread.py", line 47 in run
  File "./picard/tagger.py", line 402 in event
  File "./picard/tagger.py", line 473 in move_files
  File "./picard/tagger.py", line 456 in _file_loaded
  File "./picard/file.py", line 218 in _loading_finished
  File "./picard/util/thread.py", line 47 in run
  File "./picard/tagger.py", line 402 in event
  File "./picard/tagger.py", line 473 in move_files
  File "./picard/tagger.py", line 456 in _file_loaded
  File "./picard/file.py", line 218 in _loading_finished
  File "./picard/util/thread.py", line 47 in run
  File "./picard/tagger.py", line 402 in event
  File "./picard/tagger.py", line 473 in move_files
  File "./picard/tagger.py", line 456 in _file_loaded
  File "./picard/file.py", line 218 in _loading_finished
  File "./picard/util/thread.py", line 47 in run
  File "./picard/tagger.py", line 402 in event
  File "./picard/tagger.py", line 473 in move_files
  File "./picard/tagger.py", line 456 in _file_loaded
  File "./picard/file.py", line 218 in _loading_finished
  File "./picard/util/thread.py", line 47 in run
  File "./picard/tagger.py", line 402 in event
  File "./picard/tagger.py", line 473 in move_files
  File "./picard/tagger.py", line 456 in _file_loaded
  File "./picard/file.py", line 218 in _loading_finished
  File "./picard/util/thread.py", line 47 in run
  File "./picard/tagger.py", line 402 in event
  File "./picard/tagger.py", line 473 in move_files
  File "./picard/tagger.py", line 456 in _file_loaded
  File "./picard/file.py", line 218 in _loading_finished
  File "./picard/util/thread.py", line 47 in run
  File "./picard/tagger.py", line 402 in event
  File "./picard/tagger.py", line 473 in move_files
  File "./picard/tagger.py", line 456 in _file_loaded
  File "./picard/file.py", line 218 in _loading_finished
  ...
Aborted