java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.jivesoftware.preference.impl.PreferenceManagerImpl.getPreferenceData(PreferenceManagerImpl.java:44)
at com.jivesoftware.spark.ui.ChatWindow.(ChatWindow.java:71)
at com.jivesoftware.spark.ui.ChatRoom.(ChatRoom.java:153)
at com.jivesoftware.spark.ui.rooms.ChatRoomImpl.(ChatRoomImpl.java:78)
at com.jivesoftware.spark.ChatManager.createChatRoom(ChatManager.java:110)
at com.jivesoftware.spark.Workspace.handleOfflineMessage(Workspace.java:268)
at com.jivesoftware.spark.Workspace.handleIncomingPacket(Workspace.java:241)
at com.jivesoftware.spark.Workspace.access$100(Workspace.java:51)
at com.jivesoftware.spark.Workspace$5.run(Workspace.java:195)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)

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