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java.lang.NullPointerException: 	at org.eclipse.xtext.linking.lazy.LazyURIEncoder.getNode(LazyURIEncoder.java:255)	at org.eclipse.xtext.linking.lazy.LazyURIEncoder.decode(LazyURIEncoder.java:135)	at org.eclipse.xtext.linking.lazy.LazyLinkingResource.getEObject(LazyLinkingResource.java:224)	at org.eclipse.xtext.resource.persistence.StorageAwareResource.getEObject(StorageAwareResource.java:136)	at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.getEObject(ResourceSetImpl.java:223)	at org.osate.xtext.aadl2.ui.propertyview.CachePropertyLookupJob.lambda$0(CachePropertyLookupJob.java:114)	at org.osate.xtext.aadl2.ui.propertyview.AadlPropertyView.lambda$15(AadlPropertyView.java:2164)	at org.eclipse.xtext.resource.OutdatedStateManager.exec(OutdatedStateManager.java:121)	at org.eclipse.xtext.ui.editor.model.XtextDocument$XtextDocumentLocker.internalReadOnly(XtextDocument.java:520)	at org.eclipse.xtext.ui.editor.model.XtextDocument$XtextDocumentLocker.readOnly(XtextDocument.java:492)	at org.eclipse.xtext.ui.editor.model.XtextDocument.readOnly(XtextDocument.java:133)	at org.osate.xtext.aadl2.ui.propertyview.AadlPropertyView.safeRead(AadlPropertyView.java:2166)	at org.osate.xtext.aadl2.ui.propertyview.CachePropertyLookupJob.run(CachePropertyLookupJob.java:234)	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)