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java.lang.NullPointerException: 	at org.jivesoftware.smack.keepalive.KeepAliveManager.schedulePingServerTask(KeepAliveManager.java:274)	at org.jivesoftware.smack.keepalive.KeepAliveManager.access$400(KeepAliveManager.java:54)	at org.jivesoftware.smack.keepalive.KeepAliveManager$4.processPacket(KeepAliveManager.java:174)	at org.jivesoftware.smack.Connection$ListenerWrapper.notifyListener(Connection.java:858)	at org.jivesoftware.smack.PacketReader$ListenerNotification.run(PacketReader.java:456)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)	at java.util.concurrent.FutureTask.run(FutureTask.java:262)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:745)