Background does not exist

I used the background INT - ROCK CONCERT STAGE - NIGHT
When I add it in my script, it shows this error:

But when I preview it or watch it in the app, it appears perfectly:

I would appreciate any help, as this error is preventing me from publishing. Thank you :slight_smile:

I believe itโ€™s a hidden bg so you can preview it but you canโ€™t actually use it.

Oh, thank you!

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