There are 2 extensions that cause compiler errors in 6L02.
The first one is Conditional Undo by Jesse McGrew.
The second one is Record-Replay which is my own
and was created since there was no recording-replaying function originally in I7.
I was getting a Library message notice No such thing as LM__##
I tried to post this on the Bugs forum but my account is not working for some reason.