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java.lang.NullPointerException: null	at uk.ac.manchester.cs.owl.owlapi.OWLImmutableOntologyImpl.getImportsClosure(OWLImmutableOntologyImpl.java:842)	at uk.ac.manchester.cs.owl.owlapi.concurrent.ConcurrentOWLOntologyImpl.getImportsClosure(ConcurrentOWLOntologyImpl.java:190)	at org.semanticweb.owlapi.metrics.AbstractOWLMetric.getOntologies(AbstractOWLMetric.java:99)	at org.semanticweb.owlapi.metrics.AxiomCount.recomputeMetric(AxiomCount.java:42)	at org.semanticweb.owlapi.metrics.AxiomCount.recomputeMetric(AxiomCount.java:27)	at org.semanticweb.owlapi.metrics.AbstractOWLMetric.getValue(AbstractOWLMetric.java:82)	at org.semanticweb.owlapi.metrics.AbstractOWLMetric.getValue(AbstractOWLMetric.java:36)	at org.protege.editor.owl.ui.metrics.MetricsTableModel.getValueAt(MetricsTableModel.java:46)	at org.protege.editor.owl.ui.metrics.MetricsPanel$3.getTableCellRendererComponent(MetricsPanel.java:155)	at javax.swing.JTable.prepareRenderer(JTable.java:5723)	at javax.swing.plaf.basic.BasicTableUI.paintCell(BasicTableUI.java:2114)	at javax.swing.plaf.basic.BasicTableUI.paintCells(BasicTableUI.java:2016)	at javax.swing.plaf.basic.BasicTableUI.paint(BasicTableUI.java:1812)	at javax.swing.plaf.ComponentUI.update(ComponentUI.java:161)	at javax.swing.JComponent.paintComponent(JComponent.java:780)	at javax.swing.JComponent.paint(JComponent.java:1056)	at javax.swing.JComponent.paintToOffscreen(JComponent.java:5210)	at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(RepaintManager.java:1579)	at javax.swing.RepaintManager$PaintManager.paint(RepaintManager.java:1502)	at javax.swing.RepaintManager.paint(RepaintManager.java:1272)	at javax.swing.JComponent._paintImmediately(JComponent.java:5158)	at javax.swing.JComponent.paintImmediately(JComponent.java:4969)	at javax.swing.RepaintManager$4.run(RepaintManager.java:831)	at javax.swing.RepaintManager$4.run(RepaintManager.java:814)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)	at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:814)	at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:789)	at javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:738)	at javax.swing.RepaintManager.access$1200(RepaintManager.java:64)	at javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1732)	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)	at java.awt.EventQueue.access$500(EventQueue.java:97)	at java.awt.EventQueue$3.run(EventQueue.java:709)	at java.awt.EventQueue$3.run(EventQueue.java:703)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)