Why is it when i open my imovie it always quit unexpectedly?

If iMovie is quitting unexpectedly, it could be due to several reasons, such as corrupted application files, conflicts with other software, or outdated software. Try updating iMovie and your macOS to the latest versions, as updates often fix bugs. Additionally, consider resetting the app preferences or reinstalling iMovie to resolve any corruption issues. If the problem persists, check for any incompatible plugins or extensions that may be causing the crash.