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Cannot find a default KieSession
java.lang.RuntimeException: Cannot find a default KieSession	at org.drools.compiler.kie.builder.impl.KieContainerImpl.findKieSessionModel(KieContainerImpl.java:555)	at org.drools.compiler.kie.builder.impl.KieContainerImpl.newKieSession(KieContainerImpl.java:548)	at org.drools.compiler.kie.builder.impl.KieContainerImpl.newKieSession(KieContainerImpl.java:531)	at Drools.DroolsMain.kieTest(DroolsMain.java:43)	at Drools.DroolsMain.main(DroolsMain.java:52)