iMovie Will Not Open, Crashes During "Update" Part of Reboot

[mkibby]

Hello, I am working on a MacBook Pro with Sierra 10.12.4 and using the latest version of iMovie.

I've recently used it successfully, but now when I launch it, it begins the "update" process of loading media and then crashes. I've:

• Deleted preferences
• Deleted some files from the Transcoded Media>High Quality Media
• Deleted and reinstalled iMovie
• Run disk utility on my hard drive

...to no avail. The crash report is crazy long, so I'll upload it as a file. If somebody can please clue me in on what's happening, I'd appreciate it!