iMovie error -2009
"Unable to prepare project for publishing. Project couldn't be prepared for publishing because an error occurred. (-2009)."
I've checked capacity of computer and the external hard drive. Both have at least half of their capacity available, tried exporting to either location. I also tried to export a file that I was successfully able to export yesterday and get the same error message now. I keep the computer offline, no connection to network or internet. I've only had this computer a few months and the only purpose if it is for video work.
Any suggestions welcome.
imac, Mac OS X (10.6.5)