There’s a newer version (8/220120) online at the Friends of I7 extensions collection:
Version 8/220120 of Threaded Conversation by Chris Conley begins here.
"A conversation system tracking facts known, phrases spoken, and subjects of conversation."
"modified from Threaded Conversation by Emily Short and based on Alabaster by Emily Short, et. al."
Include Basic Screen Effects by Emily Short.
Include Complex Listing by Emily Short.
Include version 11 of Conversation Framework by Eric Eve.
Definition: a person is other if he is not the player.
VOLUME ZERO - TROUBLE PROOFING - NOT FOR RELEASE
When play begins (this is the check for mis-defined items rule):
let N be 0;
repeat with item running through quips:
if the item mentions the item:
increment N;
say "[line break][The item] mentions itself, which will cause the game to hang in play." (A);
show original
I just tried out two of the included examples on I7 6M62, and they work, so the first thing I’d do is to update the extension and see if that resolves the errors.