Zookeeper example is not working - ZooKeeper anonymous services don't seem to work

ERROR 2013-12-11 08:13:10,692 (Job notification thread) - Exception tossed: Serv
ice '_ANON_0' of type '_OUTPUTCONNECTORPOOL_null' is already active
org.apache.manifoldcf.core.interfaces.ManifoldCFException: Service '_ANON_0' of
type '_OUTPUTCONNECTORPOOL_null' is already active
        at org.apache.manifoldcf.core.lockmanager.ZooKeeperLockManager.registerS
erviceBeginServiceActivity(ZooKeeperLockManager.java:157)
        at org.apache.manifoldcf.core.lockmanager.ZooKeeperLockManager.registerS
erviceBeginServiceActivity(ZooKeeperLockManager.java:119)
        at org.apache.manifoldcf.core.connectorpool.ConnectorPool$Pool.<init>(Co
nnectorPool.java:418)
        at org.apache.manifoldcf.core.connectorpool.ConnectorPool.grab(Connector
Pool.java:243)
        at org.apache.manifoldcf.agents.outputconnectorpool.OutputConnectorPool.
grab(OutputConnectorPool.java:83)
        at org.apache.manifoldcf.crawler.system.JobNotificationThread.run(JobNot
ificationThread.java:113)