IMovie crashed and deleted connections to files

Hello

I have a huge problem.

I created a 17min movie with pictures, musik and a lot of effects.

After I nearly finished the movie my IMovie/Macbook suddenly restarted (system crashed).

It deleted all conections to the photos/Files.

It was to much work to create the video =(

Please let me know what I could do fix it.

Thanks in advance

Timo

(IMovie 10.0.8)