当我尝试在openshift jenkins上构建项目时出现以下异常

Apr 03, 2013 12:08:27 PM hudson.plugins.openshift.OpenShiftCloud provision
INFO: Provisioning new node for workload = 2 and label = null
Apr 03, 2013 12:08:27 PM hudson.plugins.openshift.OpenShiftCloud provision
INFO: Cancelling build - Label is null
Apr 03, 2013 12:08:27 PM hudson.plugins.openshift.OpenShiftCloud cancelBuild
INFO: Cancelling build
Apr 03, 2013 12:08:27 PM hudson.plugins.openshift.OpenShiftCloud cancelItem
INFO: Cancelling Item 
Apr 03, 2013 12:08:27 PM hudson.plugins.openshift.OpenShiftCloud cancelItem
WARNING: Build null rawbldr has been canceled
Apr 03, 2013 12:08:27 PM hudson.triggers.SafeTimerTask run
SEVERE: Timer task hudson.slaves.NodeProvisioner$NodeProvisionerInvoker@6d7414 failed
java.lang.UnsupportedOperationException: No Label
    at hudson.plugins.openshift.OpenShiftCloud.provision(OpenShiftCloud.java:391)
    at hudson.slaves.NodeProvisioner.update(NodeProvisioner.java:227)
    at hudson.slaves.NodeProvisioner.access$000(NodeProvisioner.java:51)
    at hudson.slaves.NodeProvisioner$NodeProvisionerInvoker.doRun(NodeProvisioner.java:308)
    at hudson.triggers.SafeTimerTask.run(SafeTimerTask.java:54)
    at java.util.TimerThread.mainLoop(Timer.java:555)
    at java.util.TimerThread.run(Timer.java:505)