Hi I'm trying to understand what is wrong with this rule. It validates in guvnor, but when running it throws an error. I am trying to write a rule that will fire if there have been less than ten trades in ten minutes. This is the rule: 1. | rule "Trade Count" 2. | dialect "mvel" 3. | when 4. | Number( trades : intValue < 10 ) 5. | from accumulate( 6. | e: TradeOrder( ) 7. | over window:size(10m), 8. | count(e) ) 9. | then 10. | TradeOrder silverTrade = new TradeOrder(); 11. | silverTrade.setMt4username( "4002642" ); 12. | silverTrade.setOperation( "OP_BUY" ); 13. | silverTrade.setStatus( OrderStatus.OPENING ); 14. | silverTrade.setSymbol( "SILVER" ); 15. | silverTrade.setVolume( 1 ); 16. | silverTrade.setOrderLots( 2 ); 17. | insert( silverTrade ); 18. | 19. | 20. | modifiedOrderList.add(silverTrade); 21. | end What I assume to be the relevant portion of the stack trace is here: Caused by: java.lang.NoSuchMethodError: org.mvel2.compiler.CompiledExpression.getParserConfiguration()Lorg/mvel2/ParserConfiguration; at org.drools.rule.constraint.MvelConstraint.createMvelConditionEvaluator(MvelConstraint.java:207) [drools-core-5.5.0.Final.jar:5.5.0.Final] at org.drools.rule.constraint.MvelConstraint.evaluate(MvelConstraint.java:190) [drools-core-5.5.0.Final.jar:5.5.0.Final] at org.drools.rule.constraint.MvelConstraint.isAllowed(MvelConstraint.java:157) [drools-core-5.5.0.Final.jar:5.5.0.Final] at org.drools.reteoo.AccumulateNode.evaluateResultConstraints(AccumulateNode.java:651) [drools-core-5.5.0.Final.jar:5.5.0.Final] at org.drools.reteoo.ReteooWorkingMemory$EvaluateResultConstraints.execute(ReteooWorkingMemory.java:590) [drools-core-5.5.0.Final.jar:5.5.0.Final] at org.drools.common.PropagationContextImpl.evaluateActionQueue(PropagationContextImpl.java:350) [drools-core-5.5.0.Final.jar:5.5.0.Final] at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:355) [drools-core-5.5.0.Final.jar:5.5.0.Final] at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:311) [drools-core-5.5.0.Final.jar:5.5.0.Final] at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:903) [drools-core-5.5.0.Final.jar:5.5.0.Final] at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:847) [drools-core-5.5.0.Final.jar:5.5.0.Final] at org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:269) [drools-core-5.5.0.Final.jar:5.5.0.Final] at org.switchyard.component.rules.exchange.drools.DroolsRulesExchangeHandler.handleMessage(DroolsRulesExchangeHandler.java:280) [switchyard-component-rules-0.6.0-SNAPSHOT.jar:0.6.0-SNAPSHOT] at org.switchyard.bus.camel.ProviderProcessor.process(CamelExchangeBus.java:216) at org.apache.camel.util.AsyncProcessorConverterHelper$ProcessorToAsyncProcessorBridge.process(AsyncProcessorConverterHelper.java:61) [camel-core-2.10.0.jar:2.10.0] ... 153 more -- View this message in context: http://drools.46999.n3.nabble.com/rule-validates-in-guvnor-but-errors-whe... Sent from the Drools: User forum mailing list archive at Nabble.com.