That error (amongst other things) is essentially what provoked the necessity of an updated Map 1 being released alongside Map 2.
Basically, the updated TR_Data (which is required for Map 2) produces that error when run alongside an older version of Map 1 which holds hand-placed instances of that butterfly, removed from the latest Data.
This means the source of the error is that you are using the public release version of Map 1, rather than the latest version bundled with Map 2, whilst simultaneously using Map 2 (presumably) and (definitely) the updated version of Data.
Update Map 1, and your issue should disappear.
I dunno what affect using BAIN or whatever will have had, having no experience of the thing... But that's certainly what the error should be.