diff --git a/ops/ss_virtual_create.py b/ops/ss_virtual_create.py
index 528f45a..949af75 100644
--- a/ops/ss_virtual_create.py
+++ b/ops/ss_virtual_create.py
@@ -20,7 +20,7 @@ class SS_Virtual_command:
         self.loginName = "root"
         self.password = "kingsome2016"
 
-    def run_cmd(cmd):
+    def run_cmd(self, cmd):
         import subprocess
         msg = "Starting run: %s " % cmd
         print("run_cmd {0}".format(msg))