Not Playing Spotify Songs or Yotube Videos

I get the error when playing Spotfty Songs or YouTube Videos ,‘WARNING Could not find a text/html decoder to handle media.
WARNING GStreamer warning: gst-stream-error-quark: No decoder available for type ‘text/html’. (6)
ERROR GStreamer error: gst-core-error-quark: Your GStreamer installation is missing a plug-in. (12)’.
I am running Arch Linux with these packages installed.
gst-editing-services 1.14.4-1
gst-libav 1.14.4+2+gc324028-1
gst-plugins-bad 1.14.4+22+ge87fb02c1-1
gst-plugins-base 1.14.4+18+g3cc7cc757-1
gst-plugins-base-libs 1.14.4+18+g3cc7cc757-1
gst-plugins-espeak 0.5.0-1
gst-plugins-good 1.14.4-2
gst-plugins-ugly 1.14.4-1
gst-python 1.14.4-1
gst-python2 1.14.4-1
gst-transcoder 1.14.1-1
gst-validate 1.14.4-1
gstreamer 1.14.4-1
gstreamer-vaapi 1.14.4+1+gb219f609-1
gstreamermm 1.10.0-1
gstreamermm-docs 1.10.0-1

Please use mopidy deps and mopidy config when reporting problems. Also take a look at the troubleshooting page of our documentation for more info.

Spotify playback works very differently to everything else so there is probably something fundamentally wrong here. Perhaps providing the rest of the log would help explain.

Output of mopidy deps:Executable: /usr/bin/mopidy
Platform: Linux-5.0.3-arch1-1-ARCH-x86_64-with-glibc2.2.5
Python: CPython 2.7.16 from /usr/lib/python2.7
Mopidy: 2.2.2 from /usr/lib/python2.7/site-packages
Pykka>=1.1: 1.2.1 from /usr/lib/python2.7/site-packages
requests>=2.0: 2.21.0 from /usr/lib/python2.7/site-packages
chardet>=3.0.2: 3.0.4 from /usr/lib/python2.7/site-packages
idna>=2.5: 2.8 from /usr/lib/python2.7/site-packages
urllib3>=1.21.1: 1.24.1 from /usr/lib/python2.7/site-packages
setuptools: 40.8.0 from /usr/lib/python2.7/site-packages
tornado>=4.4: 5.1.1 from /usr/lib/python2.7/site-packages
futures: 3.2.0 from /usr/lib/python2.7/site-packages
singledispatch: 3.4.0.3 from /usr/lib/python2.7/site-packages
six: 1.12.0 from /usr/lib/python2.7/site-packages
backports_abc>=0.4: 0.5 from /usr/lib/python2.7/site-packages
Mopidy-Youtube: 2.0.2 from /usr/lib/python2.7/site-packages
setuptools: 40.8.0 from /usr/lib/python2.7/site-packages
requests>=2.2.1: 2.21.0 from /usr/lib/python2.7/site-packages
chardet>=3.0.2: 3.0.4 from /usr/lib/python2.7/site-packages
idna>=2.5: 2.8 from /usr/lib/python2.7/site-packages
urllib3>=1.21.1: 1.24.1 from /usr/lib/python2.7/site-packages
pafy>=0.3.35: 0.5.4 from /usr/lib/python2.7/site-packages
Mopidy>=1.0: 2.2.2 from /usr/lib/python2.7/site-packages
Pykka>=1.1: 1.2.1 from /usr/lib/python2.7/site-packages
requests>=2.0: 2.21.0 from /usr/lib/python2.7/site-packages
chardet>=3.0.2: 3.0.4 from /usr/lib/python2.7/site-packages
idna>=2.5: 2.8 from /usr/lib/python2.7/site-packages
urllib3>=1.21.1: 1.24.1 from /usr/lib/python2.7/site-packages
setuptools: 40.8.0 from /usr/lib/python2.7/site-packages
tornado>=4.4: 5.1.1 from /usr/lib/python2.7/site-packages
futures: 3.2.0 from /usr/lib/python2.7/site-packages
singledispatch: 3.4.0.3 from /usr/lib/python2.7/site-packages
six: 1.12.0 from /usr/lib/python2.7/site-packages
backports_abc>=0.4: 0.5 from /usr/lib/python2.7/site-packages
Pykka>=1.1: 1.2.1 from /usr/lib/python2.7/site-packages
Mopidy-Spotify: 3.1.0 from /usr/lib/python2.7/site-packages
Mopidy>=2.0: 2.2.2 from /usr/lib/python2.7/site-packages
Pykka>=1.1: 1.2.1 from /usr/lib/python2.7/site-packages
requests>=2.0: 2.21.0 from /usr/lib/python2.7/site-packages
chardet>=3.0.2: 3.0.4 from /usr/lib/python2.7/site-packages
idna>=2.5: 2.8 from /usr/lib/python2.7/site-packages
urllib3>=1.21.1: 1.24.1 from /usr/lib/python2.7/site-packages
setuptools: 40.8.0 from /usr/lib/python2.7/site-packages
tornado>=4.4: 5.1.1 from /usr/lib/python2.7/site-packages
futures: 3.2.0 from /usr/lib/python2.7/site-packages
singledispatch: 3.4.0.3 from /usr/lib/python2.7/site-packages
six: 1.12.0 from /usr/lib/python2.7/site-packages
backports_abc>=0.4: 0.5 from /usr/lib/python2.7/site-packages
Pykka>=1.1: 1.2.1 from /usr/lib/python2.7/site-packages
pyspotify>=2.0.5: 2.0.5 from /usr/lib/python2.7/site-packages
cffi>=1.0.0: 1.12.2 from /usr/lib/python2.7/site-packages
pycparser: 2.19 from /usr/lib/python2.7/site-packages
requests>=2.0: 2.21.0 from /usr/lib/python2.7/site-packages
chardet>=3.0.2: 3.0.4 from /usr/lib/python2.7/site-packages
idna>=2.5: 2.8 from /usr/lib/python2.7/site-packages
urllib3>=1.21.1: 1.24.1 from /usr/lib/python2.7/site-packages
setuptools: 40.8.0 from /usr/lib/python2.7/site-packages
GStreamer: 1.14.4.0 from /usr/lib/python2.7/site-packages/gi
Detailed information:
Python wrapper: python-gi 3.32.0
Relevant elements:
Found:
uridecodebin
souphttpsrc
appsrc
alsasink
osssink
oss4sink
pulsesink
id3demux
id3v2mux
lamemp3enc
mpegaudioparse
mpg123audiodec
vorbisdec
vorbisenc
vorbisparse
oggdemux
oggmux
oggparse
flacdec
flacparse
shout2send
Not found:
flump3dec
mad

Output of mopidy config: [core]
cache_dir = $XDG_CACHE_DIR/mopidy
config_dir = $XDG_CONFIG_DIR/mopidy
data_dir = $XDG_DATA_DIR/mopidy
max_tracklist_length = 10000
restore_state = false

[logging]
color = true
console_format = %(levelname)-8s %(message)s
debug_format = %(levelname)-8s %(asctime)s [%(process)d:%(threadName)s] %(name)s\n %(message)s
debug_file = mopidy.log
config_file =

[audio]
mixer = software
mixer_volume =
output = autoaudiosink
buffer_time =

[proxy]
scheme =
hostname =
port =
username =
password =

[mpd]
enabled = true
hostname = localhost
port = 6400
password =
max_connections = 20
connection_timeout = 60
zeroconf = Mopidy MPD server on $hostname
command_blacklist =
default_playlist_scheme = m3u

[http]
enabled = true
hostname = 127.0.0.1
port = 6680
static_dir =
zeroconf = Mopidy HTTP server on $hostname
allowed_origins =
csrf_protection = true

[stream]
enabled = true
protocols =
http
https
mms
rtmp
rtmps
rtsp
metadata_blacklist =
timeout = 5000

[m3u]
enabled = true
base_dir =
default_encoding = latin-1
default_extension = .m3u8
playlists_dir =

[softwaremixer]
enabled = true

[file]
enabled = true
media_dirs =
~/Music
~/|Home
excluded_file_extensions =
.jpg
.jpeg
show_dotfiles = false
follow_symlinks = false
metadata_timeout = 1000

[local]
enabled = true
library = json
media_dir = ~/Music
scan_timeout = 1000
scan_flush_threshold = 100
scan_follow_symlinks = false
excluded_file_extensions =
.directory
.html
.jpeg
.jpg
.log
.nfo
.png
.txt

[youtube]
enabled = true

[spotify]
enabled = true
username = username
password = ********
client_id = c79c926d-4806-46b9-ad59-79c3d4819b14
client_secret = ********
bitrate = 320
volume_normalization = true
private_session = false
timeout = 10
allow_cache = true
allow_network = true
allow_playlists = true
search_album_count = 20
search_artist_count = 10
search_track_count = 50
toplist_countries =