Not sure why my save from 14.1 would cause anything for 15.1. I had no errors on 14.1 with the mod installed for 14.1, which I even completed all the story and had to stop playing until a new update came around. I don't know how to read those trackback error message. What can you tell me that mat be causing the errors for each one?
Though I've barely played any of the 0.15/0.15.1 release due to some many of the games I mod got released close to each other, of what little I have played of 0.15.1 was the slightly rare issue/error:
Exception: Could not find return label
of which I figure out the best thing to do since my save was in the Lobby was to immediately go to the Bar instead of letting the game continue letting me know girl x's story is complete.
So maybe jump back to the 0.14.1 release (with my mod from that version of the game) and do a save in the Lobby,
jump over to the 0.15.1 release (with the latest version of my mod that I updated last week to),
immediately jump to the Bar then continue the game and see if that helps.
If that doesn't work then send me your save and I'll take a look.