ConfigNameException: Missing namespace in Config object name xxx

Question

Drupal\Core\Config\ConfigNameException: Missing namespace in Config object name media_entity_file_replace. in Drupal\Core\Config\ConfigBase::validateName() (line 97 of core/lib/Drupal/Core/Config/ConfigBase.php).

i don't quite get what i have done wrong in my config form

media_entity_file_replace/src/Form/MediaEntityFileReplaceSettingsForm.php

namespace Drupal\media_entity_file_replace\Form;

use Drupal\Core\Form\ConfigFormBase;
use Drupal\Core\Form\FormStateInterface;

/**
 * Configure media_entity_file_replace settings for this site.
 */
class MediaEntityFileReplaceSettingsForm extends ConfigFormBase {

Answer 1

The error comes from Drupal\Core\Config\ConfigBase:

public static function validateName($name) {
  // The name must be namespaced by owner.
  if (strpos($name, '.') === FALSE) {
    throw new ConfigNameException("Missing namespace in Config object name {$name}.");
  }
...

Do you reference a configuration object somewhere in your form without a period? For example:

$config = \Drupal::config('config_with_no_namespace');