Hi,
I have created my application using Universal Theme in Oracle APEX 5.0 and created a new theme called '1. Simple Red' from repository into shared components. When I try to switch from current theme (Universal theme) to '1.simple red' theme, it throws an error as:
1 error has occurred
- This applications cannot be converted to a theme using tab-based navigation, as it uses list-based navigation. (Go to error)

Considering that the new theme is not list based, I tried making a copy of Universal Theme itself into my shared components so that all the theme's properties are in place. But, when I try to switch from universal theme to the newly copied theme which is also list based, it still throws up same error.
Is it never allowed to switch to any theme if the current theme in Universal Theme? Please clarify.