Fix: Uncaught ValueError: Unknown format specifier

Erik Larsson – June 21, 2021

This is a common issue with the new PHP 8.0 version and WordPress plugins or themes that has not been updated to work with the new PHP version.

You should report this error to the plugin or theme creator so they can fix this problem.

The easiest solution is to downgrade your current PHP version so your WordPress installation is running on the PHP version 7.4.x.

If you are a Velumi customer just login to the portal and select your website, go to the menu “PHP” and select PHP Version 7.4.

We always recommend that you upgrade your stage environment before you try it in production.

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