1704404 [Worker-23] ERROR org.eclipse.xtext.builder.clustering.CopiedResourceDescription  - java.lang.IllegalStateException: getReferenceDescriptions platform:/resource/de.mdsd.xtext.swtch.model2.ui/src/de/mdsd/xtext/swtch/model2/ui/contentassist/SwitchModel.prpr
java.lang.IllegalStateException: getReferenceDescriptions platform:/resource/de.mdsd.xtext.swtch.model2.ui/src/de/mdsd/xtext/swtch/model2/ui/contentassist/SwitchModel.prpr
	at org.eclipse.xtext.builder.clustering.CopiedResourceDescription.getReferenceDescriptions(CopiedResourceDescription.java:84)
	at org.eclipse.xtext.builder.builderState.BuilderStateUtil.copyReferenceDescriptions(BuilderStateUtil.java:59)
	at org.eclipse.xtext.builder.builderState.BuilderStateUtil.create(BuilderStateUtil.java:34)
	at org.eclipse.xtext.builder.clustering.ClusteringBuilderState.doUpdate(ClusteringBuilderState.java:267)
	at org.eclipse.xtext.builder.builderState.AbstractBuilderState.update(AbstractBuilderState.java:116)
	at org.eclipse.xtext.builder.impl.XtextBuilder.doBuild(XtextBuilder.java:287)
	at org.eclipse.xtext.builder.impl.XtextBuilder.incrementalBuild(XtextBuilder.java:267)
	at org.eclipse.xtext.builder.impl.XtextBuilder.build(XtextBuilder.java:161)
	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)