diff --git a/core/lib/Drupal/Core/Config/ConfigImporter.php b/core/lib/Drupal/Core/Config/ConfigImporter.php
index ada5841..090b883 100644
--- a/core/lib/Drupal/Core/Config/ConfigImporter.php
+++ b/core/lib/Drupal/Core/Config/ConfigImporter.php
@@ -7,6 +7,7 @@
 
 namespace Drupal\Core\Config;
 
+use Drupal\Component\Utility\String;
 use Drupal\Core\Config\ConfigEvents;
 use Drupal\Core\Config\Entity\ConfigStorageControllerInterface;
 use Drupal\Core\Config\Entity\ImportableEntityStorageInterface;
@@ -323,7 +324,7 @@ protected function importInvokeOwner($op, $name) {
       // Call to the configuration entity's storage controller to handle the
       // configuration change.
       if (!($entity_storage instanceof ImportableEntityStorageInterface)) {
-        throw new EntityStorageException('The entity storage does not support imports');
+        throw new EntityStorageException(String::format('The entity storage "@storage" for the "@entity_type" entity type does not support imports', array('@storage' => get_class($entity_storage), '@entity_type' => $entity_type)));
       }
       $entity_storage->$method($name, $new_config, $old_config);
       $this->setProcessed($op, $name);