Hi Paul--
The "%s" is a place holder, like in a printf() statement. It's there so
you can give a localized error message with some error-specific detail.
It's usually a file name or a line number or something like that. In
this case it's probably meant to be replaced with the markup of the
entity reference that is triggering the problem.
So it looks like there are two nested errors here: the primary one is
something to do with an undefined entity in the FOSI. But there also
seems to be something wrong with the message data files, or some
configuration related to them, that is causing Arbortext to fail when it
tries to lookup the text for the error (in case you were running Editor
in a French or Chinese environment, so you'd see the message in the
appropriate language).
--Clay
Clay Helberg
Senior Consultant
TerraXML