Try this:
Open
www.google.com) in your address bar and type in the search:
Lightmap texture coords out of range
I've just done that and have found a LOAD of stuff that would help.
I know it's easier to just ask someone on the forum how to fix a problem, but if you a little of your own research, you'll gradually built up an understanding on how everything fits together and so you'll get less and less error messages as you progress.
You should only post a new thread as a last resort if searching on this website,
www.map-center.com),
www.map-review.com) and
www.google.com) fails.
Then, we will be MORE than glad to help.
For the record though, I don't know how to fix this error:)