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

Problem:
You need to solve an issue related to a fatal error with the flux checkout.
Solution:
We recommend trying the following workaround. First, ensure you take a backup of your site. Then, follow the instructions provided in this documentation: Flux Checkout Fatal Error.

Please note that this solution might be outdated or not applicable to your specific case.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 issue persists, please open a new support ticket at WPML support forum for further assistance.

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

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Last updated by Andrey 1 month, 2 weeks ago.

Assisted by: Andrey.

Author Posts
March 4, 2026 at 3:34 pm #17872455

thomasD-100

I need to solve this issue

March 4, 2026 at 3:50 pm #17872556

Andrey
WPML Supporter since 06/2013

Languages: English (English ) Russian (Русский )

Timezone: Europe/Kyiv (GMT+03:00)

Thank you for contacting WPML support.

Please try the following workaround:

https://wpml.org/errata/flux-checkout-fatal-error-uncaught-valueerror-unknown-format-specifier-t/

Before making any changes, please ensure you take a backup.