Hi, this means that your sound device hasn't been initialized when launching the game. The default setting is -1, which automatically tries to find and use the correct sound driver, but if you're getting this error, try opening the acsetup.cfg file and replacing the value in digiid with one of the following options depending on your sound card drivers: ALSA, ARTS, ESSD, JACK, OSSD, SGIA, or SDL2. Hopefully one of these options should fix your issue.
Viewing post in If On A Winter's Night, Four Travelers comments
This could very well be the cause, thanks for pointing it out! But it doesn't have to be necessarily the root, any folder with English-only characters will work. The latest beta of the engine is in development right now and will probably do away with this restriction at last, but I have no idea when it will be stable enough for release. Hopefully soon!