If you're referring to the fact that the "artist" is unavailable, you'll need to convert the old style
{st:tags into the newer
{artist:tags as the Chordpro format has changed the meaning of these two in 2018 or 2019 ....
https://www.chordpro.org/chordpro/Direc … title.html
https://www.chordpro.org/chordpro/Direc … rtist.html
Otherwise, sometimes earlier versions of OnSong will mess up if there are excessive comments starting with the hash sign "#" at the beginning of the song ...
If you could be a bit more specific with your problem, I can give a more specific answer ...
Cheers
Richard