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java.lang.NullPointerException: 	at java.lang.Class.forName0(Native Method)	at java.lang.Class.forName(Class.java:171)	at org.ontoware.text2onto.ontology.OWL2Reader.read(OWL2Reader.java:160)	at org.ontoware.text2onto.pom.POMFactory.newPOM(POMFactory.java:41)	at org.ontoware.text2onto.gui.Text2Onto.doImport(Text2Onto.java:562)	at org.ontoware.text2onto.gui.Text2Onto.access$400(Text2Onto.java:42)	at org.ontoware.text2onto.gui.Text2Onto$6.actionPerformed(Text2Onto.java:363)	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)	at javax.swing.AbstractButton.doClick(AbstractButton.java:357)	at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:809)	at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:850)	at java.awt.Component.processMouseEvent(Component.java:6297)	at javax.swing.JComponent.processMouseEvent(JComponent.java:3275)	at java.awt.Component.processEvent(Component.java:6062)	at java.awt.Container.processEvent(Container.java:2039)	at java.awt.Component.dispatchEventImpl(Component.java:4660)	at java.awt.Container.dispatchEventImpl(Container.java:2097)	at java.awt.Component.dispatchEvent(Component.java:4488)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4575)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4236)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4166)	at java.awt.Container.dispatchEventImpl(Container.java:2083)	at java.awt.Window.dispatchEventImpl(Window.java:2489)	at java.awt.Component.dispatchEvent(Component.java:4488)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:674)	at java.awt.EventQueue.access$400(EventQueue.java:81)	at java.awt.EventQueue$2.run(EventQueue.java:633)	at java.awt.EventQueue$2.run(EventQueue.java:631)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)	at java.awt.EventQueue$3.run(EventQueue.java:647)	at java.awt.EventQueue$3.run(EventQueue.java:645)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:644)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)