detailed errors

src/Service/HocrSanitizerBatch.php

@@ -50,8 +50,13 @@ class HocrSanitizerBatch {
     if (!empty($results['renamed'])) {
       \Drupal::messenger()->addStatus(t('Renamed @count files.', ['@count' => count($results['renamed'])]));
     }
+
     if (!empty($results['errors'])) {
-      \Drupal::messenger()->addWarning(t('Some errors occurred: @count issues.', ['@count' => count($results['errors'])]));
+      \Drupal::messenger()->addWarning(t('Some errors occurred during the batch process:'));
+
+      foreach ($results['errors'] as $error) {
+        \Drupal::messenger()->addWarning($error);
+      }
     }
   }
 }