Problem

When deploying, you see errors similar the following:

ERROR   2018/01/01 00:00:00.000    failed to load module OpenTrafficEventLog/Open Traffic Event Log Configuration in [local]: 
com.vordel.es.EntityStoreException: no class com.vordel.opentraffic.OpenTrafficConfig
ERROR   2018/01/01 00:00:00.000    failed to load module ZeroDowntime/Zero Downtime Configuration in [local]: 
com.vordel.es.EntityStoreException: no class com.vordel.system.ZeroDowntime

Resolution

This happens when deploying a 7.5.3 configuration to a 7.5.1 gateway by mistake. This normally happens during upgrades when both versions have been installed and the wrong version was running during deployment.