diff --git a/api/python/yr/fnruntime.pyx b/api/python/yr/fnruntime.pyx
index 712f11708802ce3d6f652ed571e50bc6ee7ddf77..4c534b10eec824c81dc24ff64fd72d548ba0ce74 100644
--- a/api/python/yr/fnruntime.pyx
+++ b/api/python/yr/fnruntime.pyx
@@ -2505,7 +2505,7 @@ cdef class Fnruntime:
     def get_instance_by_name(self, name, ns, timeout):
         cdef:
             pair[CFunctionMeta, CErrorInfo] ret
-            string cinstanceID = (ns + "-" + name if ns else name).encode()
+            string cinstanceID
             int sigNo = CSignal.KILLINSTANCESYNC
             string cname = name.encode()
             string cns = ns.encode()
@@ -2513,6 +2513,8 @@ cdef class Fnruntime:
         cdef shared_ptr[CLibruntime] c_libruntime = CLibruntimeManager.Instance().GetLibRuntime()
         if c_libruntime == nullptr:
             raise RuntimeError("already finalized")
+        yr_ns = self.get_namespace()
+        cinstanceID = (ns + "-" + name if ns else yr_ns + "-" + name).encode()
         with nogil:
             c_libruntime.get().SetTenantIdWithPriority()
             ret = c_libruntime.get().GetInstance(cname, cns, ctimeout)
diff --git a/src/libruntime/fsclient/fs_intf.cpp b/src/libruntime/fsclient/fs_intf.cpp
index f21d530153a7077932141c0d24d1c8673ab29976..529cfaa32ccb10e1b1de097b3507f10f0edb0fbe 100644
--- a/src/libruntime/fsclient/fs_intf.cpp
+++ b/src/libruntime/fsclient/fs_intf.cpp
@@ -193,7 +193,7 @@ void FSIntf::HandleCheckpointRequest(const CheckpointRequest &req, CheckpointCal
             if (ExistProcessingRequestId()) {
                 CheckpointResponse resp;
                 resp.set_code(common::ERR_INNER_SYSTEM_ERROR);
-                resp.set_message("exit processing request");
+                resp.set_message("exist processing request, checkpoint error");
                 callback(resp);
                 return;
             }