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

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java.lang.NullPointerException:
at org.jivesoftware.smackx.muc.MultiUserChat.init(MultiUserChat.java:2221)
at org.jivesoftware.smackx.muc.MultiUserChat.(MultiUserChat.java:159)
at com.googlecode.gtalksms.xmpp.XmppMuc.createRoom(XmppMuc.java:185)
at com.googlecode.gtalksms.xmpp.XmppMuc.writeRoom(XmppMuc.java:69)
at com.googlecode.gtalksms.MainService.onHandleIntent(MainService.java:201)

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