I started getting this message after I got an irrop on my trip and the agent split my reservation away from my travel companion on our PNR when she rebooked us. Now, under "past trips", I cannot see that trip anymore while it is showing up in my travel companion's "past trips". I think that is why the error message pops up.

Did you have some similar snafu happening to you during the past year? If so, that might explain it. Or, just like other posters are saying, it is just another regular day on .bomb