IMovie 10.1 crashes seconds after opening!

Hi !

I use IMac 27 inches with OS Yosemite 10.10.5 . 3.4 GHz processor Intel Core i7.

I tried to find the .plist files in my library, no success. They simply don't appear.

I've had bugs before with IMovie, but no major ones like today.

I downloaded MP3 files in ITunes and I guess that is my problem. I don't know how to resolve it.

Please help ! 😐