java.lang.IllegalStateException
	at org.openide.util.Mutex.enterImpl(Mutex.java:558)
	at org.openide.util.Mutex.enter(Mutex.java:538)
	at org.openide.util.Mutex.readEnter(Mutex.java:521)
	at org.openide.util.Mutex.readAccess(Mutex.java:227)
	at org.netbeans.spi.project.support.ant.PropertyUtils$SequentialPropertyEvaluator.getProperty(PropertyUtils.java:786)
	at org.netbeans.modules.apisupport.project.Evaluator.getProperty(Evaluator.java:128)
	at org.netbeans.modules.apisupport.project.NbModuleProject.getPlatform(NbModuleProject.java:540)
	at org.netbeans.modules.apisupport.project.NbModuleProject.getPlatform(NbModuleProject.java:529)
	at org.netbeans.modules.apisupport.project.NbModuleProject.getModuleList(NbModuleProject.java:462)
	at org.netbeans.modules.apisupport.project.queries.SubprojectProviderImpl.getSubprojects(SubprojectProviderImpl.java:65)
	at org.netbeans.modules.project.ui.ProjectChooserAccessory.addSubprojects(ProjectChooserAccessory.java:399)
	at org.netbeans.modules.project.ui.ProjectChooserAccessory$ModelUpdater.run(ProjectChooserAccessory.java:663)
	at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:541)
[catch] at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:963)