PluginNotFoundException: The "custom" plugin does not exist

[error] Drupal\Component\Plugin\Exception\PluginNotFoundException: The "custom" plugin does not exist. Valid plugin IDs for Drupal\simple_sitemap\Plugin\simple_sitemap\UrlGenerator\UrlGeneratorManager are: in Drupal\Core\Plugin\DefaultPluginManager->doGetDefinition() (line 53 of /var/www/html/drupal/web/core/lib/Drupal/Component/Plugin/Discovery/DiscoveryTrait.php). [error] Drupal\Core\Entity\EntityStorageException: The "custom" plugin does not exist. Valid plugin IDs for Drupal\simple_sitemap\Plugin\simple_sitemap\UrlGenerator\UrlGeneratorManager are: in Drupal\Core\Entity\Sql\SqlContentEntityStorage->delete() (line 763 of /var/www/html/drupal/web/core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorage.php). [error] Drupal\Core\Entity\EntityStorageException: The "custom" plugin does not exist. Valid plugin IDs for Drupal\simple_sitemap\Plugin\simple_sitemap\UrlGenerator\UrlGeneratorManager are: in Drupal\Core\Entity\Sql\SqlContentEntityStorage->save() (line 817 of /var/www/html/drupal/web/core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorage.php). [error] The "custom" plugin does not exist. Valid plugin IDs for Drupal\simple_sitemap\Plugin\simple_sitemap\UrlGenerator\UrlGeneratorManager are: (/var/www/html/drupal/web/core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorage.php:817)

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Issue created by @kenorb
Comment about 1 month ago →
🇷🇺Russia walkingdexter
Need more detailed steps to reproduce.
Comment 1 day ago →
🇳🇱Netherlands eelkeblok Netherlands 🇳🇱
I ran into what appears to be the same issue and I think it is mostly unrelated to migration. There is an easy workaround, which is to remove the plugin reference from the configuration. Nevertheless, it can give some nasty effects when disabling a module that contains UrlGenerator plugins that are in use. I added some steps to reproduce.

I *assume* the OP was having this situation too. If not, my apologies. Let me know, than I'll create a different issue. Of course, the same could happen if the "custom" plugin got its plugin ID changed, which is basically the same thing; the configured plugin is no longer available.
Comment 1 day ago →
🇩🇪Germany gbyte Berlin
Shouldn't the module that implements the custom generator plugin also make sure its plugins are not being used during uninstall? I don't think it's something we should address here.
Comment 1 day ago →
🇳🇱Netherlands eelkeblok Netherlands 🇳🇱
Correct me if I'm wrong, but shouldn't Simple XML Sitemap keep track of dependencies to other modules when a plugin is added to its configuration?
Comment 1 day ago →
🇩🇪Germany gbyte Berlin
Correct me if I'm wrong, but shouldn't Simple XML Sitemap keep track of dependencies to other modules when a plugin is added to its configuration?

What would that tracking look like exactly? Any examples in the wild?
Comment 1 day ago →
🇳🇱Netherlands eelkeblok Netherlands 🇳🇱
I would say this should be a config dependency: https://www.drupal.org/docs/drupal-apis/configuration-api/configuration-... →

PluginNotFoundException: The "custom" plugin does not exist

Problem/Motivation

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Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes

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