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java.lang.NullPointerException: 	at eu.numberfour.n4js.internal.N4JSModel.getProvidedRuntimeLibraries(N4JSModel.java:362)	at eu.numberfour.n4js.internal.N4JSProject.getProvidedRuntimeLibraries(N4JSProject.java:203)	at eu.numberfour.n4js.ui.internal.N4MFProjectDependencyStrategy.getProjectDependencies(N4MFProjectDependencyStrategy.java:49)	at eu.numberfour.n4js.ui.internal.ProjectDescriptionLoadListener.getProjectDependenciesAsSet(ProjectDescriptionLoadListener.java:136)	at eu.numberfour.n4js.ui.internal.ProjectDescriptionLoadListener.updateProjectReferencesIfNecessary(ProjectDescriptionLoadListener.java:101)	at eu.numberfour.n4js.ui.building.N4JSBuildTypeTrackingBuilder.updateProjectReferencesIfNecessary(N4JSBuildTypeTrackingBuilder.java:93)	at eu.numberfour.n4js.ui.building.N4JSBuildTypeTrackingBuilder.doBuild(N4JSBuildTypeTrackingBuilder.java:75)	at org.eclipse.xtext.builder.impl.XtextBuilder.fullBuild(XtextBuilder.java:319)	at org.eclipse.xtext.builder.impl.XtextBuilder.build(XtextBuilder.java:155)	at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:735)	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:206)	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:246)	at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:301)	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:304)	at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:360)	at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:383)	at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:144)	at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:235)	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)