snd_pcm_open error for device when i try to run dinisnoise. How do I fix it?

so the error is

RtApiAlsa::getDeviceInfo: snd_pcm_open error for device (hw:0,0), Device or resource busy.

ALSA lib pcm_dmix.c:1108:(snd_pcm_dmix_open) unable to open slave

I am trying to run this application. I am running pop-os( I have followed the instruction on compiling and have compiled the app successfully. I have also tested out the pre-compiled version ( which I was able to run but did not get any audio out of it.

I then followed these instructions ( to try and fix the audio but it still did not help.

When I attempt to run din I: make sure the volume is high and that no other apps (that might output audio) are open and my bluetooth is also turned off.

Any help on how to fix this would be much appreciated.