Thanks Burke. I also posted this in reply to your comment on the thread, linked earlier, for the custom request portal.
In the end, all I needed to do was change the permissions on the jar file.
cd /opt/vmo/app-server/server/vmo/deploy/vmo-server
chmod 644 o11n-modelejb-server.jar
After that, restarted the configuration then the service. It works now. I did not have to replace any files.