JAX-RS Builder: Errors running builder 'JAX-RS Builder' on project 'openshift-helloworld'.

Using OpenShift Express Tools to create a new project - and removing comments from the JBoss EE 6 dependency <artifactId>jboss-javaee-6.0</artifactId>

Stack Trace:
java.lang.NullPointerException
at org.jboss.tools.ws.jaxrs.core.internal.builder.JaxrsMetamodelBuilder.visit(JaxrsMetamodelBuilder.java:148)
at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:69)
at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:80)
at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:80)
at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:80)
at org.eclipse.core.internal.events.ResourceDelta.accept(ResourceDelta.java:49)
at org.jboss.tools.ws.jaxrs.core.internal.builder.JaxrsMetamodelBuilder.incrementalBuild(JaxrsMetamodelBuilder.java:141)
at org.jboss.tools.ws.jaxrs.core.internal.builder.JaxrsMetamodelBuilder.build(JaxrsMetamodelBuilder.java:95)
at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:728)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:199)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:239)
at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:292)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:295)
at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:351)
at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:374)
at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:143)
at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:241)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)