The error you received and that question are linked, merging files will break things. Simply download, install, launch, and load your saves on v0.12 (assuming you're on PC)btw
btw hey man can i move my previous ver saves into 0.12? idk i used a 0.11.2 to 0.12 patch by c3p0 and now its always giving me tracebacks
The error you posted says you have two versions of the same scripts.