diff --git a/core/lib/Drupal/Core/Config/ConfigImporter.php b/core/lib/Drupal/Core/Config/ConfigImporter.php
index ed50735..4e75e61 100644
--- a/core/lib/Drupal/Core/Config/ConfigImporter.php
+++ b/core/lib/Drupal/Core/Config/ConfigImporter.php
@@ -727,8 +727,10 @@ protected function validate() {
         }
       }
       $this->eventDispatcher->dispatch(ConfigEvents::IMPORT_VALIDATE, new ConfigImporterEvent($this));
-      if (count($this->getErrors())) {
-        throw new ConfigImporterException('There were errors validating the config synchronization.');
+      $errors = $errors = $this->getErrors();
+      if (count($errors)) {
+        array_unshift($errors, 'There were errors validating the config synchronization:');
+        throw new ConfigImporterException(SafeMarkup::checkPlain(implode(" ", $errors)));
       }
       else {
         $this->validated = TRUE;