java.lang.NullPointerException: Passed null to FileOwnerQuery.getOwner(FileObject)
        at org.netbeans.api.project.FileOwnerQuery.getOwner(FileOwnerQuery.java:94)
        at org.netbeans.modules.projectimport.eclipse.core.spi.ProjectFactorySupport.areSourceRootsOwned(ProjectFactorySupport.java:665)
        at org.netbeans.modules.projectimport.eclipse.j2se.J2SEProjectFactory.createProject(J2SEProjectFactory.java:89)
        at org.netbeans.modules.projectimport.eclipse.core.Importer.importProjectStage1(Importer.java:230)
        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:176)
        at org.openide.util.Mutex.writeAccess(Mutex.java:433)
        at org.openide.util.Mutex$1R.run(Mutex.java:1305)
        at org.netbeans.api.project.ProjectManager$2$1.run(ProjectManager.java:120)
        at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:120)
        at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:499)
        at org.openide.filesystems.FileUtil.runAtomicAction(FileUtil.java:215)
        at org.netbeans.api.project.ProjectManager$2.execute(ProjectManager.java:118)
        at org.openide.util.Mutex.doWrapperAccess(Mutex.java:1320)
        at org.openide.util.Mutex.writeAccess(Mutex.java:384)
        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:572)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:997)