When switching the interface language on any topic while logged in as admin, a permanent error message appears: “Failed to preview theme because it doesn’t exist, or you don’t have permission to access it.” Regular users do not experience this issue. Steps to reproduce: Log in as admin Open a…

Issue resolved! It was caused by a stale ?preview_theme_id=6 parameter in the Chrome browser URL. Once removed, the error disappeared. Thank you for pointing that out!

Do you get this issue on a different browser with the same admin user?

No. Only Chrome. And this problem only appeared today. I just checked and other browsers don’t have this problem.

Do you see a ?preview_theme_id=ID in the browser’s address bar at any point? This error message is only shown if you’re previewing a theme with an incorrect ID. You likely did this at some point on this browser and that value “stuck” in the Chrome tab/window.

Error al cambiar la localización: aparece el mensaje "topic doesn't exist" en todos los temas

Soporte

pmusaraj (Penar Musaraj) 16 Abril, 2026 14:11 2

¿Recibes este problema en otro navegador con el mismo usuario administrador?

Tema		Respuestas	Vistas
Topic list is shown in a language (DE) but has one (DE) topic not translated Bug fixed , content-localization	8	104	21 Abril 2026
Activity details in topic list fail when default locale is bosanski jezik Support	1	634	2 Junio 2019
Theme name translations are not shown correctly Bug	0	516	7 Diciembre 2019
Uh oh - incompatibility with discourse-topic-previews plugin and latest Discourse Self-hosting	3	1213	28 Junio 2017
Invalid Format: SyntaxError: Expected "{" but "d" found Support	8	1302	11 Marzo 2019

Error al cambiar la localización: aparece el mensaje "topic doesn't exist" en todos los temas

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