Tomcat version: EWS 2.0.0.CR1

When I try to add a User Group through JON's interface, I get this error in agent's log:

2012-10-11 06:51:52,901 DEBUG [ResourceFactory.executor-1] (rhq.core.pc.inventory.CreateResourceRunner)- Throwable was found in creation report for request [10041].
java.lang.IllegalStateException: Name [roles] specified for parameter of operation [createGroup] on MBean [Users:type=UserDatabase,database=UserDatabase] is invalid. The MBean operation does not take a parameter by that name.
	at org.rhq.plugins.jmx.MBeanResourceComponent.invokeOperation(MBeanResourceComponent.java:576)
	at org.rhq.plugins.jmx.MBeanResourceComponent.invokeOperation(MBeanResourceComponent.java:524)
	at org.jboss.on.plugins.tomcat.TomcatUserDatabaseComponent.createResource(TomcatUserDatabaseComponent.java:68)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:616)
	at org.rhq.core.pc.inventory.ResourceContainer$ComponentInvocationThread.call(ResourceContainer.java:634)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
	at java.util.concurrent.FutureTask.run(FutureTask.java:166)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
	at java.lang.Thread.run(Thread.java:679)