Clear your browser cache and try again. If clearing the browser cache does not resolve the issue, close and restart your browser. When outputting using a flow from the list view or the flow debug screen, an error message may appear after upgrading.
Example of Chrome
Go to Settings > Privacy and security > Delete browsing data, and open the delete screen. Select "All time" for the Time range and "Cached images and files" for the deletion target, then click the "Delete data" button.
*Be sure to select “All Periods” since the default period may be “Past 1 hour”.