diff --git a/cpp/src/server/ServerConfig.cpp b/cpp/src/server/ServerConfig.cpp
index af5a8129c5d1878d4262d08899d082544c3a3346..09299e00324fd030fe94bd6d4ff0503d0bfd18e0 100644
--- a/cpp/src/server/ServerConfig.cpp
+++ b/cpp/src/server/ServerConfig.cpp
@@ -128,6 +128,7 @@ ErrorCode ServerConfig::ValidateConfig() const {
     }
 
     if(!resource_valid_flag) {
+        std::cerr << "Building index GPU can't be found in resource config." << std::endl;
         return SERVER_INVALID_ARGUMENT;
     }
 
diff --git a/cpp/src/utils/ValidationUtil.h b/cpp/src/utils/ValidationUtil.h
index ffaa9fefcb8b7e791eb4c62cec6cf26aab16fc8c..e504354c17edb958a0fc7cacefc33ac9365f2324 100644
--- a/cpp/src/utils/ValidationUtil.h
+++ b/cpp/src/utils/ValidationUtil.h
@@ -2,7 +2,6 @@
 
 #include "db/meta/MetaTypes.h"
 #include "Error.h"
-#include "
 
 namespace zilliz {
 namespace milvus {