java.lang.NullPointerException
   at org.netbeans.modules.autoupdate.services.UpdateManagerImpl.getUpdateUnitProvider(UpdateManagerImpl.java:256)
   at org.netbeans.api.autoupdate.UpdateElement.getUpdateUnitProvider(UpdateElement.java:166)
   at org.netbeans.api.autoupdate.UpdateElement.getSourceIcon(UpdateElement.java:151)
   at org.netbeans.modules.autoupdate.ui.Unit$Available.getSourceIcon(Unit.java:763)
   at org.netbeans.modules.autoupdate.ui.UnitDetails.buildUnitText(UnitDetails.java:120)
   at org.netbeans.modules.autoupdate.ui.UnitDetails.getUnitText(UnitDetails.java:190)
   at org.netbeans.modules.autoupdate.ui.UnitDetails.setUnit(UnitDetails.java:96)
   at org.netbeans.modules.autoupdate.ui.UnitTab.showDetailsAtRow(UnitTab.java:587)
   at org.netbeans.modules.autoupdate.ui.UnitTab.access$1500(UnitTab.java:116)
   at org.netbeans.modules.autoupdate.ui.UnitTab$11.valueChanged(UnitTab.java:624)
   at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:184)
   at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:164)
   at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:211)
   at javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSelectionModel.java:405)
   at javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSelectionModel.java:415)
   at javax.swing.DefaultListSelectionModel.setSelectionInterval(DefaultListSelectionModel.java:459)
   at org.netbeans.modules.autoupdate.ui.PluginManagerUI.selectFirstRow(PluginManagerUI.java:579)
   at org.netbeans.modules.autoupdate.ui.PluginManagerUI.refreshUnitsInAWT(PluginManagerUI.java:622)
   at org.netbeans.modules.autoupdate.ui.PluginManagerUI.updateUnitsChanged(PluginManagerUI.java:691)
   at org.netbeans.modules.autoupdate.ui.UnitTab$3.updateUnitsChanged(UnitTab.java:188)
   at org.netbeans.modules.autoupdate.ui.UnitCategoryTableModel.fireUpdataUnitChange(UnitCategoryTableModel.java:286)
   at org.netbeans.modules.autoupdate.ui.UnitTab.fireUpdataUnitChange(UnitTab.java:639)
   at org.netbeans.modules.autoupdate.ui.UnitTab$AvailableAction.performerImpl(UnitTab.java:1389)
   at org.netbeans.modules.autoupdate.ui.UnitTab$TabAction.actionPerformed(UnitTab.java:1114)
   at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
   at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
   at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
   at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
   at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
   at java.awt.Component.processMouseEvent(Component.java:6535)
   at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
   at java.awt.Component.processEvent(Component.java:6300)
   at java.awt.Container.processEvent(Container.java:2236)
   at java.awt.Component.dispatchEventImpl(Component.java:4891)
   at java.awt.Container.dispatchEventImpl(Container.java:2294)
   at java.awt.Component.dispatchEvent(Component.java:4713)
   at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4888)
   at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4525)
   at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4466)
   at java.awt.Container.dispatchEventImpl(Container.java:2280)
   at java.awt.Window.dispatchEventImpl(Window.java:2750)
   at java.awt.Component.dispatchEvent(Component.java:4713)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
   at java.awt.EventQueue.access$500(EventQueue.java:97)
   at java.awt.EventQueue$3.run(EventQueue.java:709)
   at java.awt.EventQueue$3.run(EventQueue.java:703)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
   at java.awt.EventQueue$4.run(EventQueue.java:731)
   at java.awt.EventQueue$4.run(EventQueue.java:729)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   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)