error in Pathauto configuration

you probably have some very broken configuration. try exporting config, check pathauto.pattern files for any that are completely or almost empty and don't have an id. re-import with those removed.

If that's not it then I think it won't be possible to help without having access to the site.

I've tried what you told me, and it's still failing. And now it has deleted the active configuration

the error complains about the config form renderizing:

Drupal\Core\Render\Element\Checkboxes::valueCallback(Array, false, Object(Drupal\Core\Form\FormState))\n#1 /var/www/html/web/core/lib/Drupal/Core/Form/FormBuilder.php

The error was that 8 items were saved in the path_alias table without a "/" at the beginning. Then, a reinstallation was required to generate the correct configuration.

Automatically closed - issue fixed for 2 weeks with no activity.