https://docs.flatpak.org/en/latest/getting-started.html

Spotify

''[spotifywm] attached to spotify
/app/extra/share/spotify/spotify: /usr/lib/x86_64-linux-gnu/libcurl.so.4: no version information available (required by /app/extra/share/spotify/spotify)
/app/extra/share/spotify/spotify: /usr/lib/x86_64-linux-gnu/libcurl.so.4: no version information available (required by /app/extra/share/spotify/spotify)
[spotifywm] attached to spotify
[spotifywm] attached to spotify''

rm -rf ~/.var/app/com.spotify.Client/cache