Captivate Classic for Mac OS "error" Funk sound when I use a keyboard shortcut like cmd z

Whenever I try to do cmd + anything (undo, redo, group select, select all...) it plays that "dok!" sound effect you typically only hear if you attempt an invalid function in other apps. 

This is NOT about disabling a sound when someone plays my file.

This is about the Captivate Classic app/software itself making the sound when I, as the developer, try to use keyboard shortcuts. 

Please answer this if you have experienced this with your MacBook and have managed to make this stop. If you do not use a Mac and do not know of this problem, please do not feel pressured to reply here. 

Thank you.