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java.lang.NullPointerException at org.cloudsmith.geppetto.pp.dsl.ui.container.PPWorkspaceProjectsStateHelper.getVisibleProjectNames(PPWorkspaceProjectsStateHelper.java:92) at org.cloudsmith.geppetto.pp.dsl.ui.container.PPWorkspaceProjectsStateHelper.initVisibleHandles(PPWorkspaceProjectsStateHelper.java:133) at org.cloudsmith.geppetto.pp.dsl.ui.container.PPWorkspaceProjectsState.doInitVisibleHandles(PPWorkspaceProjectsState.java:68) at org.eclipse.xtext.ui.containers.AbstractAllContainersState.initVisibleContainerHandles(AbstractAllContainersState.java:180) at org.eclipse.xtext.ui.containers.AbstractAllContainersState.getVisibleContainerHandles(AbstractAllContainersState.java:176) at org.eclipse.xtext.resource.containers.StateBasedContainerManager.getVisibleContainers(StateBasedContainerManager.java:54) at org.cloudsmith.geppetto.pp.dsl.linking.PPFinder.getExportedObjects(PPFinder.java:660) at org.cloudsmith.geppetto.pp.dsl.linking.PPFinder.buildExportedObjectsIndex(PPFinder.java:190) at org.cloudsmith.geppetto.pp.dsl.linking.PPFinder.configure(PPFinder.java:242) at org.cloudsmith.geppetto.pp.dsl.linking.PPFinder.configure(PPFinder.java:230) at org.cloudsmith.geppetto.pp.dsl.linking.PPResourceLinker.link(PPResourceLinker.java:1160) at org.cloudsmith.geppetto.pp.dsl.ui.resource.PPResource.performPPLinking(PPResource.java:106) at org.cloudsmith.geppetto.pp.dsl.ui.resource.PPResource.ensureLinkedState(PPResource.java:69) at org.cloudsmith.geppetto.pp.dsl.ui.resource.PPResource.resolveLazyCrossReferences(PPResource.java:117) at org.eclipse.xtext.EcoreUtil2.resolveLazyCrossReferences(EcoreUtil2.java:511) at org.eclipse.xtext.validation.ResourceValidatorImpl.resolveProxies(ResourceValidatorImpl.java:155) at org.eclipse.xtext.validation.ResourceValidatorImpl.validate(ResourceValidatorImpl.java:68) at org.eclipse.xtext.ui.editor.validation.ValidationJob$1.exec(ValidationJob.java:79) at org.eclipse.xtext.ui.editor.validation.ValidationJob$1.exec(ValidationJob.java:1) at org.eclipse.xtext.util.concurrent.AbstractReadWriteAcces.readOnly(AbstractReadWriteAcces.java:62) at org.eclipse.xtext.ui.editor.model.XtextDocument$XtextDocumentLocker.readOnly(XtextDocument.java:246) at org.eclipse.xtext.ui.editor.model.XtextDocument.readOnly(XtextDocument.java:84) at org.eclipse.xtext.ui.editor.validation.ValidationJob.createIssues(ValidationJob.java:75) at org.eclipse.xtext.ui.editor.validation.ValidationJob.run(ValidationJob.java:64) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:53)