You don't say enough to know whether this is the same thing, but I just got this error message in Opera 31. The context was that Opera got into a bad state where it didn't seem to be able to load any pages. So I exited, but there were still Opera processes leftover. I tried to kill them from the Task Manager, but 3 of them refused to die. When I tried to start Opera at this point, I got this message. I suspect the Opera code is misinterpreting some error condition.
Anyway, after I rebooted, all was well again.