Sorry about the confusing error, but the real issue is that there’s no audio device on the PC.
Please follow the instructions here
I’m using audio relay to stream PC’s audio in my smartphone, it was working today but suddenly this message popped up.
So what’s the solution?
If it worked before, it means that your PC had an audio device.
Is it possible that you’ve unplugged a cable for example?
Regardless, installing vb-cable as mentioned here should fix the issue