Can't export mp3 on OS X 10.15 using MuseScore 3.5.0
I am trying to export my score as an MP3 in OS X 10.15 using MuseScore 3.5.0. When I go to export, I get this message:
When I click "yes" it takes me here:
I click "open," then get this message:
Thanks for any assistance you can provide.