error when deploying backstage to 2.0.0-beta3

torquebox.log

12:17:12,586 INFO  [org.jboss.as.server.deployment] (MSC service thread 1-8) Starting deployment of "torquebox-backstage-knob.yml"
12:17:12,740 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-2) MSC00001: Failed to start service jboss.deployment.unit."torquebox-backstage-knob.yml".INSTALL: org.jboss.msc.service.StartException in service jboss.deployment.unit."torquebox-backstage-knob.yml".INSTALL: Failed to process phase INSTALL of deployment "torquebox-backstage-knob.yml"
	at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:121) [jboss-as-server-7.x.incremental.260.jar:7.x.incremental.260]
	at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1824) [jboss-msc-1.0.1.GA.jar:1.0.1.GA]
	at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1759) [jboss-msc-1.0.1.GA.jar:1.0.1.GA]
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [:1.6.0_29]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [:1.6.0_29]
	at java.lang.Thread.run(Thread.java:680) [:1.6.0_29]
Caused by: org.jboss.as.server.deployment.DeploymentUnitProcessingException: Failed to add JBoss web deployment service
	at org.jboss.as.web.deployment.WarDeploymentProcessor.processDeployment(WarDeploymentProcessor.java:275)
	at org.jboss.as.web.deployment.WarDeploymentProcessor.deploy(WarDeploymentProcessor.java:104)
	at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:115) [jboss-as-server-7.x.incremental.260.jar:7.x.incremental.260]
	... 5 more
Caused by: org.jboss.msc.service.DuplicateServiceException: Service jboss.cluster.web is already registered
	at org.jboss.msc.service.ServiceRegistrationImpl.setInstance(ServiceRegistrationImpl.java:154) [jboss-msc-1.0.1.GA.jar:1.0.1.GA]
	at org.jboss.msc.service.ServiceControllerImpl.startInstallation(ServiceControllerImpl.java:226) [jboss-msc-1.0.1.GA.jar:1.0.1.GA]
	at org.jboss.msc.service.ServiceContainerImpl.install(ServiceContainerImpl.java:560) [jboss-msc-1.0.1.GA.jar:1.0.1.GA]
	at org.jboss.msc.service.ServiceTargetImpl.install(ServiceTargetImpl.java:201) [jboss-msc-1.0.1.GA.jar:1.0.1.GA]
	at org.jboss.msc.service.ServiceControllerImpl$ChildServiceTarget.install(ServiceControllerImpl.java:2211) [jboss-msc-1.0.1.GA.jar:1.0.1.GA]
	at org.jboss.msc.service.ServiceTargetImpl.install(ServiceTargetImpl.java:201) [jboss-msc-1.0.1.GA.jar:1.0.1.GA]
	at org.jboss.msc.service.ServiceControllerImpl$ChildServiceTarget.install(ServiceControllerImpl.java:2211) [jboss-msc-1.0.1.GA.jar:1.0.1.GA]
	at org.jboss.msc.service.ServiceBuilderImpl.install(ServiceBuilderImpl.java:307) [jboss-msc-1.0.1.GA.jar:1.0.1.GA]
	at org.jboss.as.clustering.web.infinispan.DistributedCacheManagerFactory.addDependencies(DistributedCacheManagerFactory.java:108)
	at org.jboss.as.web.deployment.WarDeploymentProcessor.processDeployment(WarDeploymentProcessor.java:250)
	... 7 more

12:17:12,772 INFO  [org.jboss.as.server] (DeploymentScanner-threads - 2) JBAS015856: Undeploy of deployment "torquebox-backstage-knob.yml" was rolled back with failure message {"JBAS014671: Failed services" => {"jboss.deployment.unit.\"torquebox-backstage-knob.yml\".INSTALL" => "org.jboss.msc.service.StartException in service jboss.deployment.unit.\"torquebox-backstage-knob.yml\".INSTALL: Failed to process phase INSTALL of deployment \"torquebox-backstage-knob.yml\""}}
12:17:12,786 INFO  [org.jboss.as.server.deployment] (MSC service thread 1-4) Stopped deployment torquebox-backstage-knob.yml in 14ms
12:17:12,788 INFO  [org.jboss.as.controller] (DeploymentScanner-threads - 2) JBAS014774: Service status report
JBAS014777:   Services which failed to start:      service jboss.deployment.unit."torquebox-backstage-knob.yml".INSTALL: org.jboss.msc.service.StartException in service jboss.deployment.unit."torquebox-backstage-knob.yml".INSTALL: Failed to process phase INSTALL of deployment "torquebox-backstage-knob.yml"