Erro do spark

Bom dia,

Caros amigos,

Quando tento conversar com um usuário utilizando o spark, clico no nome do usuário porém não abre a janela da conversa. Mas quando mandam mensagens para mim a janela se abre. Verifique no log do spark e havia o seguinte erro;

05/02/2013 09:49:38 net.sf.fmj.registry.XMLRegistryIO loadDocument

INFO: FMJ registry document version 0.1

05/02/2013 09:49:38 net.sf.fmj.registry.Registry loadFromFile

INFO: Loaded registry from file: C:\Documents and Settings\margareth\.fmj.registry.xml

05/02/2013 09:49:41 org.jivesoftware.spark.util.log.Log error

SEVERE: Dictionary not found

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException

          at org.jivesoftware.spark.otrplug.impl.OTRSession$2.receivingMessage(OTRSession.ja va:142)

          at org.jivesoftware.spark.ui.rooms.ChatRoomImpl.fireReceivingIncomingMessage(ChatR oomImpl.java:557)

          at org.jivesoftware.spark.ui.rooms.ChatRoomImpl$2.run(ChatRoomImpl.java:415)

          at java.awt.event.InvocationEvent.dispatch(Unknown Source)

          at java.awt.EventQueue.dispatchEvent(Unknown Source)

          at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)

          at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)

          at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)

          at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

          at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

          at java.awt.EventDispatchThread.run(Unknown Source)

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException

          at org.jivesoftware.spark.otrplug.impl.OTRSession$2.receivingMessage(OTRSession.ja va:142)

          at org.jivesoftware.spark.ui.rooms.ChatRoomImpl.fireReceivingIncomingMessage(ChatR oomImpl.java:557)

          at org.jivesoftware.spark.ui.rooms.ChatRoomImpl$2.run(ChatRoomImpl.java:415)

          at java.awt.event.InvocationEvent.dispatch(Unknown Source)

          at java.awt.EventQueue.dispatchEvent(Unknown Source)

          at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)

          at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)

          at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)

          at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

          at java.awt.EventDispatchThread.pumpEvents(Unknown Source)

          at java.awt.EventDispatchThread.run(Unknown Source)

Se alguém poder me ajudar, desde já estarei grato.

Att,

João Pedro