Windows 10 1903 users continue to complain that Start Menu is giving a critical error message and that Edge now will not launch after installing the latest KB4517389┬ácumulative update. For some, uninstalling the recent cumulative update has fixed these issues, but for others the Start Menu problem persists. […]

from https://www.bleepingcomputer.com/news/microsoft/windows-10-1903-known-problems-in-the-kb4517389-update/