The required option Custom Group is not set.
By
peterpeter,
Posted on: 2010-01-31 02:59 in Mission Architect
could you share your fix...I am having the same issue 
It turns out I'd managed to accidentally click the 'custom group' option in an early mission of the arc. The error appears when you've got that option selected somewhere in the arc without any actual custom group selected.
I don't know if you already knew this, but clicking on the description of the error it will take you to the place where the error is happening.
Avatar: "Cheeky Jack O Lantern" by dimarie
Not for this error, interestingly.
I'm encountering an error message I can't get rid of, word-for-weord in the thread title. I've tried everything I coudl think of to get rid of it short of deleting the mission and starting again, which I don't want to do as this particular mission alone involved a few hours of work. I know this is probably in the "is it plugged in?" category of stupid questions, but it's really starting to bug me. What have I done wrong, and how do I fix it?
EDIT: Yes, it was "is it plugged in?" stupid. Hopefully this thread falls off the front page soon.