I tried! But it doesn’t work! So I post this question.
Also you can ask for help at:
How to make the right sidebar displaying everywhere? Not only the homepage and categories.
It doesn’t work for the "add topic“ button
Hmm… works fine for me when previewing on Theme Creator.
If you want to specifically target the New Topic button, try:
button#create-topic {
// add stuff here...
}
When having
- a private message
- with a tag
- viewing without sidebar
The width becomes very small
Cause:
.navigation-topics,
.categories-list,
body[class*="tag-"]:not(.archetype-regular):not(.archetype-banner),
body[class*="category-"]:not(.archetype-regular):not(.archetype-banner):not(.archetype-banner):not(.archetype-private_message) {
in fkb-d-topic-list.scss is being applied, and it shouldn’t.
I suspect it needs :not(.archetype-private_message)
However, I wonder why it is targeting these archetypes so specifically at all? Is it just trying to see whether it’s on a topic list (vs topic view?)
I’m loving this theme but I’m either encountering a bug or I broke something.
For some reason there doesn’t seem to be any padding above topics so the rounded corners sort of disappear and there’s no visible separation between each topic.
Looks like something with the new modern foundation experimental change is causing this behaviour. Turning that off seems to set the padding back to normal.
Title:
[Bug] Theme crashes on Discourse 2026.4.0-latest — Could not find module 'ember-this-fallback/js-component'
Description:
After updating Discourse to v2026.4.0-latest (commit 19374472fd), the FKB Pro theme causes a fatal frontend crash, making the forum partially unusable. Discourse shows the orange banner:
“由于主题/组件有错误,您的站点可能无法正常运行。由 ‘FKB Pro theme’ 引起。”
(Translation: “Due to an error in the theme/component, your site may not work properly. Caused by ‘FKB Pro theme’.”)
Root Cause:
The theme (or one of its components) still references the ember-this-fallback/js-component module, which has been removed from Discourse core in recent versions. This module was a compatibility shim for the deprecated Ember this-property-fallback pattern, which allowed templates to use {{foo}} instead of {{this.foo}}. Discourse officially announced the removal of this shim and required all themes/plugins to migrate to explicit this. bindings.
Error from browser console:
Failed to load theme 4 from https://www.sitetalk.net/...
Error: Could not find module 'ember-this-fallback/js-component' imported from (require)
[THEME 4 'FKB Pro theme'] Error: Could not find module 'ember-this-fallback/js-component' imported from (require)
at vendor.js
at requireModule (vendor.js)
at Object.lookup (chunk.js)
...
at reportThemeError (chunk.js)
(Discourse version shown in console: v2026.4.0-latest, Ember v6.10.1)
Environment:
| Item | Value |
|---|---|
| Discourse version | v2026.4.0-latest (commit 19374472fd) |
| Ember version | v6.10.1 |
| Theme | FKB Pro (default install from this repo) |
| Reproduction | 100% reproducible after upgrading Discourse |
We hope that the developers can fix this issue. Thanks!!!
Hello, after updating Discourse to v2026.4.0-latest — Ember v6.10.1, an error occurred, making the forum unusable:
client-error-handler.js:109 [THEME 28 ‘FKB Pro theme’] Error: Could not find module ember-this-fallback/this-fallback-helper imported from (require)
at loader.js:247:1
at a (loader.js:258:1)
at requireModule (loader.js:24:1)
at Object.lookup (app.js:36:12)
We hope this can be fixed.


