Trying to export finished project, get error -49

I'm trying to export to my hard drive Movies folder a number of finished iMovie 8.0.6 projects. They run for 3-4 hours, then at the end I get an error message that says project couldn't be exported due to error (-49).
I've searched in help and in these communites but can't find anything.
Anyone else run into this?
THaks in advance for any and all help.

Hi
Error -49 opWrErr  - File already open with write permission
Trash the preference files while application is NOT Running.
from Karsten Schlüter
Some users notice on exporting larger projects from within iMovie that this operation is aborted with an 'error -49'
This issue occours only on MacOs machines using 10.7x
try switching-off the Local Mobile Backup
in Terminal copy/paste
sudo tmutil disablelocal
Re-launch Mac
Yours Bengt W

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