Mac OSCataline user: 
I opened the game to try and run it. When I made the music lower I got this error upon pressing the enter key. Quit and restart but got this error 3 more times pressing any key trying to go back.
As it stands it appears the volume cannot be adjusted any time throughout the game or you'll get the error.
Viewing post in Corinne Cross's Dead & Breakfast comments
Hi, so the issue is with MacOS. There's a workaround though! Go to the CCDBmv folder, right click the "Game" application, and select "Show Package Contents." In that folder, go to Contents > MacOS > and select nwjs. Press OK for any popups that come up and the game should launch. You should now be able to save/load and change volume settings. You'll have to launch it this way every time you play.
So sorry for the inconvenience and thank you for your patience. Getting things to work on mac is the bane of my existence. Do let me know if this doesn't work for you!