[drools-user] NoClassDefFoundError in rule at application server

I am using JBoss 4.0.5.GA and JBossRules 3.0.5, managed by MBean.
Rules compiled at client and transferred to MBean in ObjectMessage.

If rule contains predicate or eval, engine throws NoClassDefFoundError at object assertion:

16:56:18,969 ERROR [STDERR] Caused by: java.lang.NoClassDefFoundError: player/Rule_Your_First_Rule_0
16:56:18,969 ERROR [STDERR]     at player.Rule_Your_First_Rule_0Predicate0Invoker.evaluate(Rule_Your_First_Rule_0Predicate0Invoker.java:15)
16:56:18,969 ERROR [STDERR]     at org.drools.rule.PredicateConstraint.isAllowed(Unknown Source)
16:56:18,969 ERROR [STDERR]     at org.drools.common.BetaNodeBinder.isAllowed(Unknown Source)
16:56:18,969 ERROR [STDERR]     at 
org.drools.reteoo.LeftInputAdapterNode.assertObject(Unknown Source)

Any idea, how this error can be corrected?

Thanks
Alexey