InvalidArgumentException: No converter has been registered for drupal.proxy_original_service.paramconverter.configentity_admin

After running composer update did you run database updates, either via update.php or drush?

See https://www.drupal.org/docs/updating-drupal/updating-drupal-core-via-com... for more information.

Same the problem.

Were there any errors whatsoever during the upgrade?

If someone provides the information needed to set up a Drupal site that reproduces this bug, we can work towards fixing it.

The website encountered an unexpected error. Try again later.

InvalidArgumentException: No converter has been registered for drupal.proxy_original_service.paramconverter.configentity_admin in Drupal\Core\ParamConverter\ParamConverterManager->getConverter() (line 37 of core/lib/Drupal/Core/ParamConverter/ParamConverterManager.php).
Drupal\Core\ParamConverter\ParamConverterManager->convert() (Line: 90)
Drupal\Core\Access\AccessManager->checkNamedRoute() (Line: 187)
Drupal\Core\Menu\DefaultMenuLinkTreeManipulators->menuLinkCheckAccess() (Line: 76)
Drupal\Core\Menu\DefaultMenuLinkTreeManipulators->checkAccess() (Line: 80)
Drupal\Core\Menu\DefaultMenuLinkTreeManipulators->checkAccess() (Line: 80)
Drupal\Core\Menu\DefaultMenuLinkTreeManipulators->checkAccess()
call_user_func() (Line: 114)
Drupal\Core\Menu\MenuLinkTree->transform() (Line: 123)
Drupal\toolbar\Controller\ToolbarController::preRenderGetRenderedSubtrees()
call_user_func_array() (Line: 107)
Drupal\Core\Render\Renderer->doTrustedCallback() (Line: 914)

i am also facing same error i have clear all cache using Drush , manuall cache file and even database also

public function getConverter($converter) {
if ($this->converters->has($converter)) {
return $this->converters->get($converter);
}

// Workaround: Drupal's lazy-service proxy renaming can leak the
// "drupal.proxy_original_service.X" ID into the locator's key map
// instead of the plain service ID. Retry under the plain ID.
$proxy_prefix = 'drupal.proxy_original_service.';
if (str_starts_with($converter, $proxy_prefix)) {
$plain_id = substr($converter, strlen($proxy_prefix));
if ($this->converters->has($plain_id)) {
return $this->converters->get($plain_id);
}
}

throw new \InvalidArgumentException(sprintf('No converter has been registered for %s', $converter));
}

i have replaced this / core/lib/Drupal/Core/ParamConverter/ParamConverterManager.php for Quick fixes and worked ...

but it not permenet solution

The lazy: true flag was removed from paramconverter.configentity_admin in #3436295: ParamConverterManager lazy services are broken and should use a service locator so I don't understand why it is still being treated as lazy? Is your core.services.yml modified in some way, or do you have something altering or replacing this service? Can you reproduce this on a fresh install of 11.4?

FWIW - @altbzh1 Was this site perhaps on the Pantheon platform?

I ran into this same issue. I was given an incomplete procedure, which omitted two changes needed on a site I was upgrading on Pantheon.

composer require pantheon-systems/drupal-integrations:^11.2
composer require pantheon-upstreams/upstream-configuration

I got this exact same error once I applied their drupal-integrations:^11.2.

After I required the pantheon-upstreams/upstream-configuration, the error was corrected. The site was no longer white-screened, and caches were able to be cleared as expected.