Well, I'm not on that flight, but I got the same annoying message when I tried to do OLCI for Flight 158 (SFO-ORD, departs 11:15 PM tonight).

I tried OLCI several times, starting last night, and finally today I phoned the 1K line to find out what's up. She transferred me to Web Support, I described the error messages, and he said that it's because of an equipment change.

I finally tried again just now, and this time it allowed OLCI for the flight. ^ It became apparent from the new seat assignment and seat map that indeed there IS an equipment switch. @:-) Instead of a domestic (2-cabin) 767-300, it is the new international configuration 767-300. Now that will be exciting if it actually happens, but I have had one prior incident in which it was supposed to be a new international config, but at the last minute the equipment was swapped for the old config, so.... we shall see!