Go in Audirvana preferences panel and remove your music folder(s) there (all the folder(s) of music you have there) delete them with minus sign.
Close Audirvana.
Apple hide the Home Folder in User Library at some time depending on OS System…
When you have clicked your Home Folder, and cannot see the Library Folder in there,
just do a ‘‘cmd J’’ to show the folder settings preferences and see at the bottom…
click Show Library Folder and then you’ll have access to the rest forever.
Go to User… Home Folder… Library… Applications Support… Audirvana Folder…
Trash All the files in that folder (that is your database of music, back it up! or not elsewhere)
AudirvanaDatabase.sqlite, but remove others if you have old version of .sqlite… for Origin or Studio not Starting to convert them at first launch.
Then, go to User… Home Folder… Library… Preferences… trash com.audirvana.Audirvana-Origin.plist in that folder (those are Audirvana Studio software preferences, back them up or not). You don’t have to trash them , but we don’t know if you have corrupted preferences, or bad database yet… not a big deal, since you are new using it.
Restart Mac.
Open Audirvana, add a Music folder, at first, it will sync in top middle of main window… then it will analyze all your files. Euh?? not sure now if it is only Studio analyzing files, but in both cases, LET IT GO, even better don’t try to adjust windows or edit files, even playing music while it is not finished… you’ll see the progress bar going… Could be long the first time depending on how large your library is, and Mac is fast or not… go to sleep if it is too long 
then when it is done, you can try starting a song, it will ask for installing System Optimizer… go on, song playing, cool, close Audirvana, yes, close it
then, go back in the application folder and copy the database .sqlite file somewhere else as a today backup… perfect file, no bug in it, no doubles…
Reopen Audirvana and enjoy your Music.