diff --git a/consts/errorcode/error_code.go b/consts/errorcode/error_code.go
index 8dffeb3..7cd230b 100644
--- a/consts/errorcode/error_code.go
+++ b/consts/errorcode/error_code.go
@@ -8,4 +8,5 @@ const (
 	BadArgument     = "BadArgument"
 	TaskNotFound    = "TaskNotFound"
 	Unauthorized    = "Unauthorized"
+	UnknownError    = "UnknownError"
 )