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This exception has no message.
java.lang.NullPointerException: 	at com.springsource.sts.roo.ui.internal.maven.RooProjectConfigurator.doConfigure(RooProjectConfigurator.java:56)	at com.springsource.sts.roo.ui.internal.maven.RooProjectConfigurator.doConfigure(RooProjectConfigurator.java:56)	at com.springsource.sts.maven.AbstractSpringProjectConfigurator.configure(AbstractSpringProjectConfigurator.java:36)	at org.eclipse.m2e.core.project.configurator.AbstractLifecycleMapping.configure(AbstractLifecycleMapping.java:72)	at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager.updateProjectConfiguration(ProjectConfigurationManager.java:302)	at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager.updateProjectConfiguration(ProjectConfigurationManager.java:277)	at org.eclipse.m2e.core.ui.internal.UpdateConfigurationJob.runInWorkspace(UpdateConfigurationJob.java:87)	at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:38)	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)