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java.lang.IllegalStateException: Not connected to server.	at org.jivesoftware.smack.XMPPConnection.sendPacket(XMPPConnection.java:445)	at org.jivesoftware.smackx.MessageEventManager.sendCancelledNotification(MessageEventManager.java:297)	at org.jivesoftware.spark.ui.rooms.ChatRoomImpl.closeChatRoom(ChatRoomImpl.java:221)	at org.jivesoftware.spark.ui.ChatContainer.cleanupChatRoom(ChatContainer.java:532)	at org.jivesoftware.spark.ui.ChatContainer.access$000(ChatContainer.java:89)	at org.jivesoftware.spark.ui.ChatContainer$1.tabRemoved(ChatContainer.java:121)	at org.jivesoftware.spark.component.tabbedPane.SparkTabbedPane.fireTabRemoved(SparkTabbedPane.java:350)	at org.jivesoftware.spark.component.tabbedPane.SparkTabbedPane.close(SparkTabbedPane.java:375)	at org.jivesoftware.spark.ui.ChatContainer.closeTab(ChatContainer.java:798)	at org.jivesoftware.spark.ui.ChatContainer.closeAllChatRooms(ChatContainer.java:565)