I launch day 8-14 final and it loads correctly.
Did you unpack the rpas? The game doesn't generate rpycs; it uses the ones in the rpas.
I unpacked the rpas, then ran unrpyc to decompile messages.rpy and def.rpy.
Lines 237 of messages.rpy is
Code:
$ pm("m",__("Grüß dich Kotori!"))
Lines 79 of def.rpy is
Code:
av_contacts[personal_name]["incomming"].append([["text",send,message]])
I see nothing there that would cause the crash you see.
Are you running a clean version of D8-14, or did you change something?
Have you tried deleting the save directory, in case your persistent file has some oddity in it?