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java.lang.NullPointerException: 	at de.timroes.axmlrpc.serializer.SerializerHandler.serialize(SerializerHandler.java:221)	at de.timroes.axmlrpc.serializer.StructSerializer.serialize(StructSerializer.java:99)	at de.timroes.axmlrpc.serializer.SerializerHandler.serialize(SerializerHandler.java:224)	at de.timroes.axmlrpc.Call.getXMLParam(Call.java:88)	at de.timroes.axmlrpc.Call.getXML(Call.java:64)	at de.timroes.axmlrpc.XMLRPCClient$Caller.call(XMLRPCClient.java:659)	at de.timroes.axmlrpc.XMLRPCClient$Caller.run(XMLRPCClient.java:587)