am migrating apex code from 4.2 to 5.0. Before we used the theme "Light Blue - 15" and now in order to use the navigation menu feature, we want to switch theme to "Universal Theme - 42".
When switching, one error window popped up and said "This application cannot be converted to a theme using list-based navigation, as it uses two levels of tabs. Please update the application and set current tabs settings to use only one level of tabs prior to switching the theme."
Then I checked my app current theme "Light Blue - 15" and it said this is one level tabs customized:
Is there anything wrong? Can you give me some help on how to resolve this kind of error?
Thank you very much for your help!