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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.bitcoinj.net.ConnectionHandler.setWriteOps(ConnectionHandler.java:106)	at org.bitcoinj.net.ConnectionHandler.writeBytes(ConnectionHandler.java:152)	at org.bitcoinj.core.PeerSocketHandler.sendMessage(PeerSocketHandler.java:90)	at org.bitcoinj.core.Peer.ping(Peer.java:1535)	at org.bitcoinj.core.Peer.ping(Peer.java:1526)	at org.bitcoinj.core.PeerGroup$12.run(PeerGroup.java:1679)	at com.google.common.util.concurrent.MoreExecutors$ScheduledListeningDecorator$NeverSuccessfulListenableFutureTask.run(MoreExecutors.java:648)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)	at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at org.bitcoinj.utils.ContextPropagatingThreadFactory$1.run(ContextPropagatingThreadFactory.java:35)	at java.lang.Thread.run(Thread.java:744)