If you have updated your Mac to 10.15 (Catalina) you may get an error about missing fonts when running Aered.
Aered expects to find these fonts in /Library/Fonts but they have been moved to another folder with this OS update.
Until we release a software update, the workaround for now is to copy these files:
/System/Library/Fonts/Supplemental/Verdana.ttf
/System/Library/Fonts/Supplemental/Verdana Bold.ttf
/System/Library/Fonts/Supplemental/Arial Bold.ttf
into the folder:
/Library/Fonts