java.lang.IllegalStateException
        at java.util.AbstractList$Itr.remove(AbstractList.java:356)
        at org.netbeans.modules.projectimport.eclipse.j2se.J2SEProjectFactory.addLaunchConfigurations(J2SEProjectFactory.java:224)
        at org.netbeans.modules.projectimport.eclipse.j2se.J2SEProjectFactory.createProject(J2SEProjectFactory.java:137)
        at org.netbeans.modules.projectimport.eclipse.core.Importer.importProjectStage1(Importer.java:233)
        at org.netbeans.modules.projectimport.eclipse.core.Importer.access$600(Importer.java:69)
        at org.netbeans.modules.projectimport.eclipse.core.Importer$3.run(Importer.java:178)
        at org.netbeans.modules.projectimport.eclipse.core.Importer$3.run(Importer.java:175)
        at org.openide.util.Mutex.writeAccess(Mutex.java:394)
        at org.netbeans.modules.projectimport.eclipse.core.Importer.importProject(Importer.java:175)
        at org.netbeans.modules.projectimport.eclipse.core.Importer.access$200(Importer.java:69)
        at org.netbeans.modules.projectimport.eclipse.core.Importer$1.run(Importer.java:108)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:573)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1005)