JBoss ON Agent fails to successfully parse the plugin descriptor found in rhq-platform-plugin-4.12.0.JON330GA.jar

Issue

• As I want to register the agent by running the rhq-agent.sh, I got following errors:

...
RHQ 4.12.0.JON330GA [e347f77] (Mon Nov 17 20:23:34 CET 2014)
The agent is waiting for plugins to be downloaded...
Failed to start the agent
java.lang.RuntimeException: Cannot initialize the plugin container
        at org.rhq.core.pc.plugin.PluginManager.<init>(PluginManager.java:191)
        at org.rhq.core.pc.PluginContainer.initialize(PluginContainer.java:290)
        at org.rhq.enterprise.agent.AgentMain.startPluginContainer(AgentMain.java:2066)
        at org.rhq.enterprise.agent.AgentMain.start(AgentMain.java:757)
        at org.rhq.enterprise.agent.AgentMain.main(AgentMain.java:461)
Caused by: java.lang.IllegalArgumentException: Plugin [Platforms] is required by plugins [[Apache, Augeas]] but it does not exist in the dependency graph yet
        at org.rhq.core.clientapi.agent.metadata.PluginDependencyGraph.getDeepDependencies(PluginDependencyGraph.java:329)
        at org.rhq.core.clientapi.agent.metadata.PluginDependencyGraph.getDeepDependencies(PluginDependencyGraph.java:342)
        at org.rhq.core.clientapi.agent.metadata.PluginDependencyGraph.getDeepDependencies(PluginDependencyGraph.java:342)
        at org.rhq.core.clientapi.agent.metadata.PluginDependencyGraph.getDeploymentOrder(PluginDependencyGraph.java:245)
        at org.rhq.core.pc.plugin.PluginManager.<init>(PluginManager.java:169)
        ... 4 more
Agent will be restarted soon to see if the failure condition cleared up
...

• Agent fails to register with the server and logs the following error:

2014-11-27 14:47:14,378 ERROR [main] (rhq.core.clientapi.descriptor.AgentPluginDescriptorUtil)- Validation fatal error while parsing [rhq-platform-plugin-4.12.0.JON330GA.jar:META-INF/rhq-plugin.xml] at line 18, column 165: cvc-enumeration-valid: Value 'Killiseconds' is not facet-valid with respect to enumeration '[none, percentage, bits, kilobits, megabits, gigabits, terabits, petabits, bytes, kilobytes, megabytes, gigabytes, terabytes, petabytes, epoch_milliseconds, epoch_seconds, jiffys, nanoseconds, microseconds, milliseconds, seconds, minutes, hours, days, kelvin, celsius, fahrenheit]'. It must be a value from the enumeration.
2014-11-27 14:47:14,379 ERROR [main] (rhq.core.pc.plugin.PluginManager)- Plugin at [file:/opt/jboss/jon/rhq-agent/plugins/rhq-platform-plugin-4.12.0.JON330GA.jar] could not be loaded and will therefore not be deployed.
org.rhq.core.clientapi.agent.PluginContainerException: Could not successfully parse the plugin descriptor [META-INF/rhq-plugin.xml] found in plugin jar at [file:/opt/jboss/jon/rhq-agent/plugins/rhq-platform-plugin-4.12.0.JON330GA.jar].
    at org.rhq.core.clientapi.descriptor.AgentPluginDescriptorUtil.loadPluginDescriptorFromUrl(AgentPluginDescriptorUtil.java:398)
    at org.rhq.core.pc.plugin.PluginManager.<init>(PluginManager.java:153)
    at org.rhq.core.pc.PluginContainer.initialize(PluginContainer.java:290)
    at org.rhq.enterprise.agent.AgentMain.startPluginContainer(AgentMain.java:2066)
    at org.rhq.enterprise.agent.AgentMain.start(AgentMain.java:757)
    at org.rhq.enterprise.agent.AgentMain.main(AgentMain.java:461)
Caused by: org.rhq.core.clientapi.agent.PluginContainerException: [Warning] javax.xml.bind.UnmarshalException: [Warning] null
    ... 6 more
Caused by: org.rhq.core.util.exception.WrappedRemotingException: [Warning] null
    at org.rhq.core.util.exception.WrappedRemotingException.getCause(WrappedRemotingException.java:121)
    at java.lang.Throwable.printStackTraceAsCause(Throwable.java:543)
...

• Receive error like "Plugin [Platforms] is required by plugins [[Apache, Augeas]] but it does not exist in the dependency graph yet"