How to successfully open a stu app whose opening with CEV15.2 displays an error message?

Issue
After retrieving the app sta with CEV15.2 from the PLC, changes are made to the same app and then saved in stu. Then opening this app will display the following error message:

Product Line
M580

Environment
Windows 10 Pro, Control Expert V15.2

Resolution

• The workaround we provide is as follows :
• Open the app in sta format,
• Export the project in zef format
• Close the .sta and open the .zef and make a save in stu format then close this application in zef format
• Open the application in .stu format and normally the problem before now disappears

Released for: Schneider Electric USA