iMovie: An error occurred during export.

Hello, I have been having a very irritating glitch on iMovie for the past 5 months. While exporting to camera roll, a popup comes up and says "An error occurred during export." I have been editing and exporting with iMovie for about two years and it has never happened before. I do not want to delete & reinstall the app because I already have several videos edited.

I see a post from last year saying the same problem was resolved in communities and the "Solved" response was not a solution.

iPhone 5s

iOS 10.3

Latest iMovie update as of March 30 2017

1080p material

All lengths of videos (1 minute to 10 minute video)

This is NOT a WiFi issue!

This is a major problem. Any comment or suggestion will be highly appreciated!