Just encountered a fatal error on a site after a code deployment which included an update hook to disable purge_ui, a site threw an unrecoverable error that we didn't experience during testing.
Drupal\Component\Plugin\Exception\PluginException: Plugin [error] (purge_ui_block_queuer) instance class "Drupal\purge_ui\Plugin\Purge\Queuer\PurgeBlockQueuer" does not exist.
Stacktrace
Stack trace:
#0
/docroot/core/lib/Drupal/Core/Plugin/Factory/ContainerFactory.php(17):
Drupal\Component\Plugin\Factory\DefaultFactory::getPluginClass('purge_ui_block_...',
Array, 'Drupal\\purge\\Pl...')
#1
/docroot/core/lib/Drupal/Component/Plugin/PluginManagerBase.php(84):
Drupal\Core\Plugin\Factory\ContainerFactory->createInstance('purge_ui_block_...',
Array)
#2
/docroot/modules/contrib/purge/src/IteratingServiceBaseTrait.php(36):
Drupal\Component\Plugin\PluginManagerBase->createInstance('purge_ui_block_...')
#3
/docroot/modules/contrib/purge/src/Plugin/Purge/Queuer/QueuersService.php(57):
Dru...Manager.php(188):
Drupal\Core\Cache\Cache::invalidateTags(Array)
#9
/docroot/core/lib/Drupal/Core/Plugin/CachedDiscoveryClearer.php(31):
Drupal\Core\Plugin\DefaultPluginManager->clearCachedDefinitions()
#10
/docroot/core/lib/Drupal/Core/ProxyClass/Plugin/CachedDiscoveryClearer.php(83):
Drupal\Core\Plugin\CachedDiscoveryClearer->clearCachedDefinitions()
#11
/docroot/modules/contrib/lightning_core/lightning_core.drush.inc(29):
Drupal\Core\ProxyClass\Plugin\CachedDiscoveryClearer->clearCachedDefinitions()
#12
/vendor/drush/drush/includes/command.inc(422):
drush_lightning_core_pre_updatedb()
#13
/vendor/drush/drush/includes/command.inc(231):
_drush_invoke_hooks(Array, Array)
#14
/vendor/drush/drush/includes/command.inc(199):
drush_command()
#15
/vendor/drush/drush/lib/Drush/Boot/BaseBoot.php(67):
drush_dispatch(Array)
#16
/vendor/drush/drush/includes/preflight.inc(66):
Drush\Boot\BaseBoot->bootstrap_and_dispatch()
#17 /vendor/drush/drush/drush.php(12):
drush_main()
#18 {main}
Not sure
Closed: cannot reproduce
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
We encountered this today after enabling the Purge UI module (where it is normally disabled in this environment), then after using it we uninstalled it. We then got the exact same error as in the original issue, which was very unexpected and led to some unfortunate downtime.