Fix method

Change-Id: I33af360c21dc0f43fba1ea9f62203d06735171c4
diff --git a/cicd-lab-pipeline.groovy b/cicd-lab-pipeline.groovy
index b63c58a..a55d96e 100644
--- a/cicd-lab-pipeline.groovy
+++ b/cicd-lab-pipeline.groovy
@@ -257,7 +257,7 @@
                 }
                 salt.enforceState(saltMaster, 'I@nginx:server', 'nginx')
 
-                successMsg("""
+                common.successMsg("""
     ============================================================
     Your CI/CD lab has been deployed and you can enjoy it:
     Use sshuttle to connect to your private subnet: