Could not set the locale

After changing the PHP version from 8.3 to 8.4 I find many of this lines in the error protocol (2 or 3 per minute):

…/core/src/Revolution/modX.php : 2679) Could not set the locale. Please check if the locale de_DE.UTF-8 exists on your system

What does it mean and what can I do to avoid this?

The provider is netcup.com

In the modx system settings the locale is set to de_DE.UTF-8

MODX runs the PHP function setlocale (setlocale(LC_ALL, 'de_DE.UTF-8')), but the function call returns false, most likely because the specified locale does not exist on the server.

Try to contact the hosting provider about this.

Thanks! I’ll contact them tomorrow. Let’s see what they say.