diff --git a/backend/packages/harness/deerflow/skills/projection.py b/backend/packages/harness/deerflow/skills/projection.py
index a9e783dde..5a75e3a52 100644
--- a/backend/packages/harness/deerflow/skills/projection.py
+++ b/backend/packages/harness/deerflow/skills/projection.py
@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+import errno
 import hashlib
 import json
 import logging