FWIW, regardless of the error code, the message to "unplug the computer" (if accurately reported) has got to be one of the lamest error message I've seen in a long time, especially when trying to close an application.
Unplug what? Power? Network? Other?
If power, and the user is on a desktop, then data is lost. If the user is on a laptop, nothing will happen unless the battery is dead.
In any case, I would encourage dah to attempt to save the return before closing the application.
He might even get a better error message/code.
Finally, since most people end up here because of "controlled folders", there are reasonable steps in a post from Carl on page 3 of this thread.
