java.nio.channels.CancelledKeyException: This exception has no message.

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java.nio.channels.CancelledKeyException:
at sun.nio.ch.SelectionKeyImpl.ensureValid(SelectionKeyImpl.java:73)
at sun.nio.ch.SelectionKeyImpl.interestOps(SelectionKeyImpl.java:77)
at org.apache.zookeeper.server.NIOServerCnxn.sendBuffer(NIOServerCnxn.java:151)
at org.apache.zookeeper.server.NIOServerCnxn.sendResponse(NIOServerCnxn.java:1082)
at org.apache.zookeeper.server.NIOServerCnxn.process(NIOServerCnxn.java:1119)
at org.apache.zookeeper.server.WatchManager.triggerWatch(WatchManager.java:120)
at org.apache.zookeeper.server.WatchManager.triggerWatch(WatchManager.java:92)
at org.apache.zookeeper.server.DataTree.setData(DataTree.java:620)
at org.apache.zookeeper.server.DataTree.processTxn(DataTree.java:807)
at org.apache.zookeeper.server.ZKDatabase.processTxn(ZKDatabase.java:329)
at org.apache.zookeeper.server.ZooKeeperServer.processTxn(ZooKeeperServer.java:1026)
at org.apache.zookeeper.server.FinalRequestProcessor.processRequest(FinalRequestProcessor.java:116)
at org.apache.zookeeper.server.SyncRequestProcessor.flush(SyncRequestProcessor.java:200)
at org.apache.zookeeper.server.SyncRequestProcessor.run(SyncRequestProcessor.java:131)

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