Hello forum members

My site is using the latest version of WordPress 6.8.2 and the 2025 Block Theme and BBPress Forum.

I want to use the classic theme for BBPress Forum instead of the Block Theme

Please guide me how can I activate my favorite classic theme instead of the default BBPress theme?

Thanks

[@robin-w Moderator 8 months ago]

bbpress works fine with classic themes (ie non block themes), so you should have no problems.

However bbpress is an integral plugin to your website, so it will use whatever theme your site is using, so you cannot have one theme for wordpress and another for bbpress.

[@ar_m Participant 8 months ago]

Thanks for your quick response.

I didn’t know that you can’t use separate templates on the site and the forum.

My problem is that, on the one hand, I want the Block Theme 2025 template to be active on the site, and on the other hand, in the forum, when I click on the tags or enter a phrase in the search field, the following error is displayed in the site header

HP Warning: Undefined array key “archive” in /home/…../public_html/wp-includes/block-template.php on line 180

Can you tell me how to fix this error?

Thank you in advance for your help.

[@robin-w Moderator 8 months ago]

can you state exactly what the ‘Block Theme 2025’ is, as I cannot find a theme with exactly this name.

If you have a link, that would be useful

[@ar_m Participant 8 months ago]

Thanks for your reply

I mean the twentytwentyfive WordPress theme block template.

To view live errors, you can:

1- By entering the forum home page address

https://ghazavatonline.ir/forums/

In the forum search form, enter a desired phrase and then press enter. Instead of displaying the search results, you will see in the header the error:

Warning: Undefined array key “archive” in /home/ … /public_html/wp-includes/block-template.php on line 180

Warning: Undefined array key “archive” in /home/ … /public_html/wp-includes/block-template.php on line 180

2-Also, when you click on any of the tags that have topics assigned to them, instead of displaying the tags, the above error code is displayed and no topics are displayed

For this, visit the address

شکایت از قاضی دادگاه به علت عوض کردن جای متهم ها

Click on the tag “تخلفات انتظامی قضات”

Or go directly to the link

https://ghazavatonline.ir/forums/topic-tag/disciplinary-breaches-of-judges/

to see the same errors in the header and that no topic associated with the selected tag is displayed.

Of course, it should be noted that the above errors are only generated when the twentytwentyfive block template is activated

But when the twentytwentyfour and twentytwentythree templates are activated, they are not generated and work without problems.

[@robin-w Moderator 8 months ago]

ok, what other bbpress related plugins are you usin?

[@ar_m Participant 8 months ago]

The only bbPress-related plugin that is installed and actived on the site is the “Enable bbPress for Block Themes” plugin.

[@robin-w Moderator 8 months ago]

ok, I see that in parallel you have been pursuing this with their support (which would have been useful information to post here, and saved me some duplicate testing time)

I will continue on that thread, so that their author gets to see the communication

[@ar_m Participant 8 months ago]

Of course, not exactly at the same time, but I initially announced the issue in the plugin forum, and after a day, I saw that there was no response. Due to the importance of the issue, which had an immediate negative impact on both the SEO of the forum content and its visitors, I raised it here to access the inevitable quick response.

Considering your recent response, now that I have visited the plugin forum, I have seen the responses provided, which I will respond to there.

I sincerely thank you for your efforts in solving the problem and your quick responses.

[@zainee123 Participant 1 week ago]

I’m actually looking into this as well 👀

I’m planning to convert my existing WordPress site into a full forum using bbPress, and the classic/default theme setup is something I’m trying to understand better.

From what I’ve gathered so far, it seems like the process is:

* install and activate bbPress plugin
* create forums from the dashboard
* then adjust the theme (or use a child theme) to make it look more like a proper forum

I’m still a bit unsure about the best way to properly switch or enforce the “classic” bbPress layout across the site.

Would love to hear how you approached it — especially if you managed to fully convert your site into a forum-style experience rather than just adding forums as a section.

Thanks! 👍