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java.lang.NullPointerException: 	at org.springframework.roo.addon.roobot.eclipse.client.AddOnRooBotEclipseOperationsImpl.installOrUpgradeAddOn(AddOnRooBotEclipseOperationsImpl.java:115)	at org.springframework.roo.addon.roobot.eclipse.client.AddOnEclipseCommands.install(AddOnEclipseCommands.java:36)	at org.springframework.roo.shell.eclipse.Bootstrap.install(Bootstrap.java:291)	at com.springsource.sts.roo.ui.internal.actions.RooAddOnManagerActionDelegate.doInstall(RooAddOnManagerActionDelegate.java:105)	at com.springsource.sts.roo.ui.internal.actions.RooAddOnManagerActionDelegate.access$0(RooAddOnManagerActionDelegate.java:84)	at com.springsource.sts.roo.ui.internal.actions.RooAddOnManagerActionDelegate$1.run(RooAddOnManagerActionDelegate.java:73)	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)