Unable to prepare project for publishing error (-50)

Hi,
After adding a slow motion effect to one clip of the project, iMovie started to fail to preview the images when moving the mouse over clips (in the storyboard), then a few of the clips just wanished from the storyboard and became grey.
Project can't be previewed using the play button.
And I get the error (-50) pops up when trying to finalize the project.
Any idea how to fix this ?
Thanks.

I wanted to duplicated the project and try to find what's causing the issue (https://discussions.apple.com/message/18964007#18964007).
Now I see that my project is listed in the projects list as non-editable (the edit project button is greyed out).
The "duplicate project " action is disabled, too.

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