Redering error Imovie 10.0.7

Hello.

Im getting a redering error: -50 every time I try to render my first movie. It happends at the same time all the time, at a certain clip. I read that one solution is to delete this clip. But for me I might as well delete the project. Theres gotta be another way. I cannot see anything wrong with the clip I must use and it is recorded in the same batch as the other clips with the same camera.

I hope there is some sound advice out there!

Thanks 🙂