[rules-users] java.lang.NoSuchFieldError: DESCR

[rahulkrishnan]

Am a newbe to the Drools.

When am trying
http://www.softwarepassion.com/getting-started-with-drools-flow/ tutorial 
to run the program in this tutorial it is giving this exception

Exception in thread "main" java.lang.NoSuchFieldError: DESCR
	at
org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:539)
	at
org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:28)
	at
com.softwarepassion.droolsflow.SPDroolsFlowExample.readKnowledgeBase(SPDroolsFlowExample.java:30)
	at
com.softwarepassion.droolsflow.SPDroolsFlowExample.main(SPDroolsFlowExample.java:20)


how can i resolve this one

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