org.eclipse.swt.SWTException: Failed to execute runnable (java.lang.NullPointerException)

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Failed to execute runnable (java.lang.NullPointerException)
org.eclipse.swt.SWTException: Failed to execute runnable (java.lang.NullPointerException)
at java.util.concurrent.ConcurrentHashMap.hash(Unknown Source)
at org.springframework.ide.eclipse.roo.ui.internal.RooShellView.openShell(RooShellView.java:133)
at org.springframework.ide.eclipse.roo.ui.internal.wizard.RooAddOnManagerDialog$1.run(RooAddOnManagerDialog.java:61)
at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135)
at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4144)
at org.eclipse.jface.operation.ModalContext$ModalContextThread.block(ModalContext.java:173)
at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:388)
at org.eclipse.jface.dialogs.ProgressMonitorDialog.run(ProgressMonitorDialog.java:507)
at org.springsource.ide.eclipse.commons.frameworks.ui.internal.tasks.SynchUITask.execute(SynchUITask.java:77)
at org.springsource.ide.eclipse.commons.frameworks.ui.internal.tasks.TaskManager.runSynch(TaskManager.java:29)
at org.springsource.ide.eclipse.commons.frameworks.ui.internal.plugins.PluginManagerDialog.resynchPluginsList(PluginManagerDialog.java:820)
at org.springsource.ide.eclipse.commons.frameworks.ui.internal.plugins.PluginManagerDialog.createCommandArea(PluginManagerDialog.java:313)
at org.springsource.ide.eclipse.commons.frameworks.ui.internal.plugins.CommandDialog.createDialogArea(CommandDialog.java:75)
at org.eclipse.jface.dialogs.TitleAreaDialog.createContents(TitleAreaDialog.java:155)
at org.eclipse.jface.window.Window.create(Window.java:431)
at org.eclipse.jface.dialogs.Dialog.create(Dialog.java:1089)
at org.springframework.ide.eclipse.roo.ui.internal.actions.RooAddOnManagerActionDelegate.run(RooAddOnManagerActionDelegate.java:67)
at org.springframework.ide.eclipse.roo.ui.internal.actions.RooAddOnManagerAction.run(RooAddOnManagerAction.java:43)
at org.eclipse.jface.action.Action.runWithEvent(Action.java:498)
at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:584)
at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:501)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4169)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2701)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2665)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2499)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:353)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:629)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:584)
at org.eclipse.equinox.launcher.Main.run(Main.java:1438)

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