ArchLinux: Mopidy won't start, Gst TypeError

Hi, I have an issue with mopidy, It refuses to start,

INFO     Starting Mopidy 2.1.0
INFO     Loading config from builtin defaults
INFO     Loading config from /home/jakub/.config/mopidy/mopidy.conf
INFO     Loading config from command line options
INFO     Enabled extensions: mpd, http, stream, m3u, softwaremixer, file, local
INFO     Disabled extensions: spotify, tidal
WARNING  Found spotify configuration errors, the extension has been automatically disabled:
WARNING    spotify/username must be set.
WARNING    spotify/password must be set.
WARNING  Found tidal configuration errors, the extension has been automatically disabled:
WARNING    tidal/username must be set.
WARNING    tidal/password must be set.
WARNING  Please fix the extension configuration errors or disable the extensions to silence these messages.
INFO     Starting Mopidy mixer: SoftwareMixer
INFO     Starting Mopidy audio
INFO     Starting Mopidy backends: StreamBackend, M3UBackend, FileBackend, LocalBackend
ERROR    Unhandled exception in Audio (urn:uuid:dda07aa1-6409-42c2-8f79-12775ca3f786):
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/pykka/actor.py", line 192, in _actor_loop
self.on_start()
  File "/usr/lib/python2.7/site-packages/mopidy/audio/actor.py", line 437, in on_start
self._setup_playbin()
  File "/usr/lib/python2.7/site-packages/mopidy/audio/actor.py", line 458, in _setup_playbin
playbin.set_property('flags', _GST_PLAY_FLAGS_AUDIO)
AttributeError: 'NoneType' object has no attribute 'set_property'
INFO     No local library metadata cache found at /home/jakub/.local/share/mopidy/local/library.json.gz. Please run `mopidy local scan` to index your local music library. If you do not have a local music collection, you can disable the local backend to hide this message.
INFO     Loaded 0 local tracks using json
INFO     Starting Mopidy core
INFO     Starting Mopidy frontends: MpdFrontend, HttpFrontend
INFO     MPD server running at [::ffff:127.0.0.1]:6600
INFO     HTTP server running at [::ffff:127.0.0.1]:6680
INFO     Starting GLib mainloop
INFO     New MPD connection from [::ffff:127.0.0.1]:33238
INFO     New MPD connection from [::ffff:127.0.0.1]:33242
INFO     New MPD connection from [::ffff:127.0.0.1]:33246
INFO     New MPD connection from [::ffff:127.0.0.1]:33250
INFO     New MPD connection from [::ffff:127.0.0.1]:33254
INFO     New MPD connection from [::ffff:127.0.0.1]:33258
INFO     New MPD connection from [::ffff:127.0.0.1]:33262
INFO     New MPD connection from [::ffff:127.0.0.1]:33266

And after running mopidy local scan:

Traceback (most recent call last):
  File "/usr/bin/mopidy", line 11, in <module>
sys.exit(main())
  File "/usr/lib/python2.7/site-packages/mopidy/__main__.py", line 134, in main
return args.command.run(args, proxied_config)
  File "/usr/lib/python2.7/site-packages/mopidy/local/commands.py", line 142, in run
result = scanner.scan(file_uri)
  File "/usr/lib/python2.7/site-packages/mopidy/audio/scan.py", line 67, in scan
pipeline, signals = _setup_pipeline(uri, self._proxy_config)
  File "/usr/lib/python2.7/site-packages/mopidy/audio/scan.py", line 96, in _setup_pipeline
_setup_decodebin(src, src.get_static_pad('src'), pipeline, signals)
  File "/usr/lib/python2.7/site-packages/mopidy/audio/scan.py", line 124, in _setup_decodebin
pipeline.add(element)
  File "/usr/lib/python2.7/site-packages/gi/overrides/Gst.py", line 60, in add
if not Gst.Bin.add(self, arg):
TypeError: Argument 1 does not allow None as a value

Everything up to date and pacman -Syu-ed a minute ago.