Why does node.getNodeConfiguration() throw an exception ?

When I try to figure out what is a node configuration with the following kind of code :

    ConfigureForm form = null;

     try {

          form = node.getNodeConfiguration();

     }

     catch (NoResponseException ex) {

          ex.printStackTrace();         return;

     }

I got that :

java.util.NoSuchElementException         at java.util.ArrayList$Itr.next(ArrayList.java:834)         at

org.jivesoftware.smackx.pubsub.provider.FormNodeProvider.createReturnExtension(F ormNodeProvider.java:40)         at org.jivesoftware.smack.provider.EmbeddedExtensionProvider.parseExtension(Embedd edExtensionProvider.java:105)         at org.jivesoftware.smack.util.PacketParserUtils.parsePacketExtension(PacketParser Utils.java:813)         at org.jivesoftware.smackx.pubsub.provider.PubSubProvider.parseIQ(PubSubProvider.j ava:48)         at org.jivesoftware.smack.util.PacketParserUtils.parseIQ(PacketParserUtils.java:44 0)         at org.jivesoftware.smack.tcp.PacketReader.parsePackets(PacketReader.java:170)          at org.jivesoftware.smack.tcp.PacketReader.access$000(PacketReader.java:47)          at org.jivesoftware.smack.tcp.PacketReader$1.run(PacketReader.java:81)

org.jivesoftware.smack.SmackException$NoResponseException

Am I missing something ?