So, I started a new save to test something. I noticed that not only did v1.3b result in an error message for me, but v1.3a also started giving me the error message when I tried that as well. Outside of the text boxes showing up, v1.3a had worked for me before, so I wondered why it wasn't working for me now. I think what happened was I progressed far enough into the game that something story-wise seemed to break the mod. I started a new save and the mod seems to work again for that save and that save alone. When v1.3a dropped, I was right before the point where you fight Team Meteor in Tanzan Mountain, and besides the text boxes, the mod worked. When v1.3b dropped, I was just before Adrienn's gym battle, and neither of the versions worked. It seems that, for me, something story-wise between these two points breaks the mod for me. On a fresh save, v1.3b seems to work just fine.