Failed while installing JPA 2.0.

java.lang.NullPointerException
at org.eclipse.jpt.common.core.internal.resource.ModuleResourceLocator.getDefaultResourceLocation(ModuleResourceLocator.java:34)
at org.eclipse.jpt.jpa.core.internal.facet.JpaFacetInstallDelegate.defaultResourceLocation(JpaFacetInstallDelegate.java:141)
at org.eclipse.jpt.jpa.core.internal.facet.JpaFacetInstallDelegate.createPersistenceXml(JpaFacetInstallDelegate.java:111)
at org.eclipse.jpt.jpa.core.internal.facet.JpaFacetInstallDelegate.createProjectXml(JpaFacetInstallDelegate.java:101)
at org.eclipse.jpt.jpa.core.internal.facet.JpaFacetInstallDelegate.execute_(JpaFacetInstallDelegate.java:62)
at org.eclipse.jpt.jpa.core.internal.facet.JpaFacetActionDelegate.execute(JpaFacetActionDelegate.java:34)
at org.eclipse.wst.common.project.facet.core.internal.FacetedProject.callDelegate(FacetedProject.java:1477)
at org.eclipse.wst.common.project.facet.core.internal.FacetedProject.modifyInternal(FacetedProject.java:441)
at org.eclipse.wst.common.project.facet.core.internal.FacetedProject.mergeChangesInternal(FacetedProject.java:1181)
at org.eclipse.wst.common.project.facet.core.internal.FacetedProject.access$2(FacetedProject.java:1117)
at org.eclipse.wst.common.project.facet.core.internal.FacetedProject$1.run(FacetedProject.java:324)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2344)
at org.eclipse.wst.common.project.facet.core.internal.FacetedProject.modify(FacetedProject.java:339)
at org.jboss.tools.maven.jpa.configurators.JpaProjectConfigurator.configureFacets(JpaProjectConfigurator.java:124)
at org.jboss.tools.maven.jpa.configurators.JpaProjectConfigurator.configure(JpaProjectConfigurator.java:87)
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.configureNewMavenProject(ProjectConfigurationManager.java:234)
at org.eclipse.m2e.core.internal.project.ProjectConfigurationManager.importProjects(ProjectConfigurationManager.java:150)
at org.eclipse.m2e.core.ui.internal.wizards.MavenImportWizard$1.doCreateMavenProjects(MavenImportWizard.java:164)
at org.eclipse.m2e.core.ui.internal.wizards.AbstractCreateMavenProjectsOperation.run(AbstractCreateMavenProjectsOperation.java:73)
at org.eclipse.m2e.core.ui.internal.wizards.MavenImportWizard$3.runInWorkspace(MavenImportWizard.java:249)
at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:38)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)