IMovie '11 Unable to prepare project for publishing (~50)

So I've started this problem and as an avid YouTuber I need to produce videos. I've tried clearing the cache, typing in commands on terminal, reducing the size, exporting through all options, restarting and shuting down.
So guys please help me. I've tried everything.
If your wondering what I'm using
MacBook Pro 15" Retina
Mountain Lion (10.8.2)
iMovie '11 9.0.8
Internal Harddrive (150 gb free)
No time machine
If Bengt Wärleby then I'm not listing because I don't understand anything.
Thank you and don't post "Duplicate Disscussion" because they don't work.

Hello,  We are having a similar problem running iMovie '09.  We get the exact same error as you reported. 
"Unable to prepare project for publishing" The project could not be prepared for publishing because an error occurred (-50)
We have a very similar situation were we have multiple repeated clips.  However, our clips are 2.4 's.  Like you, we took the finished project and started eliminating edits that we thought might be preventing it from exporting. The following actions still would not allow the project to export:
removing title pages
removing transitions
removing imported music from iTunes
removed another clip from another event
closed all other programs
closed iMovie, powered off computer, opened iMovie, tried to export
reconfirmed the last project exported would still export - it did without issueThe only difference between the project that will export and the one that does not are these short (2.4's) repeating clips
When we create the new project from the recorded event without making any edits (just as recorded), it exports without issue.  We have started the arduous task of adding back in each edit and testing it for export until we determine which edit is causing it to "not export".  This is a very inefficient way of troubleshooting.
This is a science project for my son and we need to be able to save it as a QT or mpeg4 movie so that he can submit it to his teacher for viewing and a grade!
Any ideas from any other users would be greatly appreciated.

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