Crashes

Hi. Ive been using iMovie for about two years. It was always fine... until now. I used to make videos and then I would edit them on iMovie. But now, when I go onto the app, it starts loading and then the app stops and crashes. This has never happened to me before. Plz fix this! Thanks for your time.

Elerbean1803(948:""16 about iMovie, v2.2.3