diff --git a/src/idempotency/client/client_channel.c b/src/idempotency/client/client_channel.c
index 6d50c65..cf7c0e3 100644
--- a/src/idempotency/client/client_channel.c
+++ b/src/idempotency/client/client_channel.c
@@ -170,9 +170,9 @@ void client_channel_destroy()
 {
 }
 
-struct fast_task_info *alloc_channel_task(IdempotencyClientChannel *channel,
-        const uint32_t hash_code, const char *server_ip, const uint16_t port,
-        int *err_no)
+static struct fast_task_info *alloc_channel_task(IdempotencyClientChannel
+        *channel, const uint32_t hash_code, const char *server_ip,
+        const uint16_t port, int *err_no)
 {
     struct fast_task_info *task;
 
diff --git a/src/idempotency/server/server_handler.c b/src/idempotency/server/server_handler.c
index 68a338a..2519225 100644
--- a/src/idempotency/server/server_handler.c
+++ b/src/idempotency/server/server_handler.c
@@ -201,6 +201,9 @@ IdempotencyRequest *sf_server_update_prepare_and_check(
     *result = idempotency_channel_add_request(channel, request);
     if (*result == EEXIST) {
         if (!request->finished) {
+            response->error.length = sprintf(response->error.message,
+                    "idempotency req id: %"PRId64" exists but NOT "
+                    "finished", request->req_id);
             *result = EAGAIN;
         }
     }