Message "error=13, Permission denied" when upgrading JBoss ON

Issue

• JBoss ON upgrade fails with the following error:

./jon-server-3.3.0.GA/bin/rhqctl upgrade --from-server-dir /opt/jboss/jon/jon-server-3.1.2 --from-agent-dir /opt/jboss/jon/rhq-agent
17:19:10,926 INFO  [org.jboss.modules] JBoss Modules version 1.3.3.Final-redhat-1
17:19:11,038 INFO  [org.rhq.server.control.command.Upgrade] Stopping any running RHQ components...
RHQ Server                     (no pid file) is ✘down
17:19:11,076 WARN  [org.rhq.server.control.command.Stop] It appears that the storage node is not installed. The --storage option will be ignored.
17:19:11,077 ERROR [org.rhq.server.control.RHQControl] error=13, Permission denied