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.

خطأ عند تغيير اللغة: تظهر رسالة "الموضوع غير موجود" في جميع المواضيع

الدعم

pmusaraj (Penar Musaraj) 16 أبريل 2026، 2:11م 2

هل تواجه هذه المشكلة في متصفح آخر باستخدام نفس حساب المسؤول؟

الموضوع		الردود	مرات العرض
Topic list is shown in a language (DE) but has one (DE) topic not translated Bug content-localization , fixed	8	67	21 أبريل 2026
Activity details in topic list fail when default locale is bosanski jezik Support	2	627	3 يونيو 2019
Theme name translations are not shown correctly Bug	0	515	7 ديسمبر 2019
Uh oh - incompatibility with discourse-topic-previews plugin and latest Discourse Self-hosting	4	1204	15 مايو 2024
Invalid Format: SyntaxError: Expected "{" but "d" found Support	10	1285	11 مارس 2019

خطأ عند تغيير اللغة: تظهر رسالة "الموضوع غير موجود" في جميع المواضيع

الموضوعات ذات الصلة