One of your themes or plugins needs updating for compatibility with upcoming Discourse core changes

[efuetatem1 (Efuet A Andrew)]

Greetings,

I updated our Discourse instance yesterday (https://world-like-home.community) and received the message below. I can’t identify which “themes or plugins” it’s referring to. Any guidance would be of great help.

Thanks

[Admin Notice] One of your themes or plugins needs updating for compatibility with upcoming Discourse core changes. (id:discourse.plugin-outlet-tag-name )

[Moin]

It is definitely a theme (component), because when I disable themes using safe mode the error in the browser console disappears.
I think it’s “theme-9” which seems to be your banner

[efuetatem1 (Efuet A Andrew)]

Thanks very much @Moin