Error when exporting my imovie project

Hi there,

Everytime I try to export my iMovie project I get the following error:

“Unable to prepare project for publishing. The project could not be prepared for publishing because an error occurred. (-50)”

As proposed in other discussions I have optimized every single clip. However the error is still popping up. Would be much appreciated if anyone could help me.

Many thanks in advance.

Jodok

Can someone please help.

Many Thanks