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org.eclipse.core.runtime.AssertionFailedException: null argument:Realm cannot be null	at org.eclipse.core.runtime.Assert.isNotNull(Assert.java:85)	at org.eclipse.core.databinding.observable.ChangeManager.(ChangeManager.java:37)	at org.eclipse.core.databinding.observable.AbstractObservable.(AbstractObservable.java:29)	at org.eclipse.core.databinding.observable.value.AbstractObservableValue.(AbstractObservableValue.java:42)	at org.eclipse.core.internal.databinding.property.value.SimplePropertyObservableValue.(SimplePropertyObservableValue.java:50)	at org.eclipse.core.databinding.property.value.SimpleValueProperty.observe(SimpleValueProperty.java:70)	at org.eclipse.core.databinding.property.value.ValueProperty.observe(ValueProperty.java:107)	at org.eclipse.emf.databinding.internal.EMFValuePropertyDecorator.observe(EMFValuePropertyDecorator.java:109)	at org.eclipse.incquery.runtime.evm.specific.DefaultAttributeMonitor.observeAllAttributes(DefaultAttributeMonitor.java:94)	at org.eclipse.incquery.runtime.evm.specific.DefaultAttributeMonitor.registerFor(DefaultAttributeMonitor.java:70)	at org.eclipse.incquery.runtime.evm.api.RuleInstance$DefaultMatchAppearProcessor.activationMissing(RuleInstance.java:140)	at org.eclipse.incquery.runtime.evm.api.RuleInstance$DefaultMatchEventProcessor.processMatchEvent(RuleInstance.java:102)	at org.eclipse.incquery.runtime.evm.api.RuleInstance$DefaultMatchAppearProcessor.process(RuleInstance.java:147)	at org.eclipse.incquery.runtime.api.MatchUpdateAdapter.notifyAppearance(MatchUpdateAdapter.java:91)	at org.eclipse.incquery.runtime.internal.boundary.CallbackNode.update(CallbackNode.java:43)	at org.eclipse.incquery.runtime.rete.network.ReteContainer.messageConsumptionSingleThreaded(ReteContainer.java:457)	at org.eclipse.incquery.runtime.rete.network.Network.waitForReteTermination(Network.java:312)	at org.eclipse.incquery.runtime.rete.network.ReteContainer.flushUpdates(ReteContainer.java:335)	at org.eclipse.incquery.runtime.rete.network.ReteContainer.connectAndSynchronize(ReteContainer.java:173)	at org.eclipse.incquery.runtime.rete.matcher.RetePatternMatcher.connect(RetePatternMatcher.java:134)	at org.eclipse.incquery.runtime.rete.matcher.RetePatternMatcher.connect(RetePatternMatcher.java:155)	at org.eclipse.incquery.runtime.api.impl.BaseMatcher.addCallbackOnMatchUpdate(BaseMatcher.java:313)	at org.eclipse.incquery.runtime.evm.specific.rule.SimpleMatcherRuleInstance.prepareInstance(SimpleMatcherRuleInstance.java:45)	at org.eclipse.incquery.runtime.evm.specific.rule.SimpleMatcherRuleSpecification.instantiateRule(SimpleMatcherRuleSpecification.java:73)	at org.eclipse.incquery.runtime.evm.api.RuleBase.internalInstantiateRule(RuleBase.java:86)	at org.eclipse.incquery.runtime.evm.api.RuleBase.instantiateRule(RuleBase.java:78)	at org.eclipse.incquery.runtime.evm.api.RuleEngine.internalAddRule(RuleEngine.java:201)	at org.eclipse.incquery.runtime.evm.api.RuleEngine.addRule(RuleEngine.java:179)