If you haven't tried already, we'd recommend a quick reinstall, followed by turning your device off and on. That should do the trick!
If not, the issue could be caused by the playback device. You can check if there are any devices available. Open CMD and execute the following command :
control mmsys.cpl sounds
Set one of the devices as default (or change the current one), then restart Spotify and see if it works.
Didn't help? Search for more Spotify Answers, or create a new thread and ask the Community.