diff --git a/ge/client/ge_api.cc b/ge/client/ge_api.cc
index 05671408..5d149920 100644
--- a/ge/client/ge_api.cc
+++ b/ge/client/ge_api.cc
@@ -212,7 +212,7 @@ std::string GEGetErrorMsg() {
 }
 
 std::string GEGetWarningMsg() {
-  return ErrorManager::GetInstance.GetWarningMessage();
+  return ErrorManager::GetInstance().GetWarningMessage();
 }
 
 // Initialize session，which calls innerSession