TypeError: Cannot read properties of undefined

I was trying to upload a log from the old Wotlk 3.3.5a client so I could analyze trinket procs but I get the above error on the first line. I assume the format of the logs has changed? Are there any details anywhere so I can possibly modify the logs for analysis?

thank you

The earliest log format supported by the site is MoP (when the site came into existence). I have been told Cata logs work just fine as well, but I don’t think anyone has ever tried to upload anything older (until now). If you want to make the log file available somewhere, I could take a look.