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

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java.lang.NullPointerException:
at org.jivesoftware.messenger.muc.HistoryStrategy$Type.valueOf(HistoryStrategy.java:1)
at org.jivesoftware.messenger.muc.HistoryStrategy.setTypeFromString(HistoryStrategy.java:221)
at org.jivesoftware.messenger.muc.HistoryStrategy.setContext(HistoryStrategy.java:241)
at org.jivesoftware.messenger.muc.spi.MultiUserChatServerImpl.initialize(MultiUserChatServerImpl.java:483)

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