Some theme could have been removed (or are extending a removed theme) but they are set somewhere as user theme, course theme, category theme.
The administrator, course creator/teacher, user should be aware of it. Display an alert message so the user notices the issue.
FYI: when this issue happens, Moodle always fallback to theme_config::DEFAULT_THEME
- has been marked as being related by
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MDL-40874 Retire MyMobile as a standard theme
- Closed