diff --git a/appbuilder/core/components/retriever/baiduvdb_retriever.py b/appbuilder/core/components/retriever/baiduvdb_retriever.py
index 1b55acfc4..70b73db88 100644
--- a/appbuilder/core/components/retriever/baiduvdb_retriever.py
+++ b/appbuilder/core/components/retriever/baiduvdb_retriever.py
@@ -50,6 +50,14 @@
 FIELD_METADATA: str = "metadata"
 INDEX_VECTOR: str = "vector_idx"
 
+VALUE_NONE_ERROR = "Parameter `{}` can not be None."
+NOT_SUPPORT_INDEX_TYPE_ERROR = (
+    "Unsupported index type: `{}`, supported index types are {}"
+)
+NOT_SUPPORT_METRIC_TYPE_ERROR = (
+    "Unsupported metric type: `{}`, supported metric types are {}"
+)
+
 def _try_import() -> None:
     try:
         import pymochow