Theme and Plugins Localisation cannot be opened and it shows critical error

This thread is resolved. Here is a description of the problem and solution.

Problem:
If you're experiencing a critical error when trying to access WPML -> Theme and Plugins Localisation, it might be due to a known issue.
Solution:
We recommend applying the fix detailed on our errata page. Please visit https://wpml.org/errata/flux-checkout-fatal-error-uncaught-valueerror-unknown-format-specifier-t/ and follow the instructions provided there to resolve the issue. After applying the fix, you should be able to access the Theme and Plugins Localisation option without encountering the critical error.

Please note that this solution might be irrelevant if it's outdated or not applicable to your case. We highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If the problem persists, please open a new support ticket.

This is the technical support forum for WPML - the multilingual WordPress plugin.

Everyone can read, but only WPML clients can post here. WPML team is replying on the forum 6 days per week, 22 hours per day.

This topic is split from https://wpml.org/forums/topic/some-strings-are-not-translated-3/

Tagged: Known issue

This topic contains 5 replies, has 0 voices.

Last updated by adriO 5 hours, 3 minutes ago.

Assisted by: Kor.

Author	Posts
January 23, 2026 at 1:09 pm #17757142
adriO	Hay Kor, Great. Thanks... Note: when I go to WPML -> Theme and Plugins Localisation I get a critical error. I can hit the back button but still, I'm not able to enter this option. Yet another ticket? LOL
January 23, 2026 at 4:48 pm #17757925
Kor WPML Supporter since 08/2022 Languages: English (English ) Timezone: Asia/Singapore (GMT+08:00)	Thanks for your patience. I've applied the fix here https://wpml.org/errata/flux-checkout-fatal-error-uncaught-valueerror-unknown-format-specifier-t/ and the WPML -> Theme and Plugins Localisation can be accessed now. Please check.
January 23, 2026 at 5:32 pm #17757971
adriO	Thank you Kor! I can access it now. Let's see what I can screw up with it.... LOL 🙂
January 23, 2026 at 5:38 pm #17757976
Kor WPML Supporter since 08/2022 Languages: English (English ) Timezone: Asia/Singapore (GMT+08:00)	Thanks for your reply. Please remember to backup first 🙂
January 23, 2026 at 6:57 pm #17758127
adriO	Why a backup when you are on my side? 🙂 🙂
January 23, 2026 at 7:34 pm #17758193
Kor WPML Supporter since 08/2022 Languages: English (English ) Timezone: Asia/Singapore (GMT+08:00)	🙂 Ok, I'll mark this ticket as resolved. I will update the status for your other ticket as quickly as possible.
January 26, 2026 at 3:59 pm #17763455
adriO	Hey Kor, I have marked as resolved. I see that it is tagged as a known issue. Does that mean I can expect it to happen at the next site I try to translate and open it?