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java.lang.IllegalArgumentException: prefix cannot be "null" when creating a QName	at javax.xml.namespace.QName.(QName.java:251)	at com.sun.xml.internal.stream.events.XMLEventAllocatorImpl.getQName(XMLEventAllocatorImpl.java:254)	at com.sun.xml.internal.stream.events.XMLEventAllocatorImpl.getXMLEvent(XMLEventAllocatorImpl.java:76)	at com.sun.xml.internal.stream.events.XMLEventAllocatorImpl.allocate(XMLEventAllocatorImpl.java:53)	at com.sun.xml.internal.stream.XMLEventReaderImpl.nextEvent(XMLEventReaderImpl.java:84)	at com.sun.xml.internal.stream.XMLEventReaderImpl.next(XMLEventReaderImpl.java:248)	at org.wso2.carbon.mediator.transform.stream.IOElementPipe.populateEvents(IOElementPipe.java:90)	at org.wso2.carbon.mediator.transform.stream.IOElementPipe.getData(IOElementPipe.java:68)	at org.wso2.carbon.mediator.transform.stream.ElementInputStream.read(ElementInputStream.java:61)	at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:283)	at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:325)	at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:177)	at java.io.InputStreamReader.read(InputStreamReader.java:184)	at org.apache.xerces.impl.XMLEntityScanner.load(Unknown Source)	at org.apache.xerces.impl.XMLEntityScanner.skipString(Unknown Source)	at org.apache.xerces.impl.XMLVersionDetector.determineDocVersion(Unknown Source)	at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)	at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)	at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)	at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)	at org.milyn.delivery.sax.SAXParser.parse(SAXParser.java:70)	at org.milyn.delivery.sax.SmooksSAXFilter.doFilter(SmooksSAXFilter.java:75)	at org.milyn.delivery.sax.SmooksSAXFilter.doFilter(SmooksSAXFilter.java:61)	at org.milyn.Smooks._filter(Smooks.java:516)	at org.milyn.Smooks.filterSource(Smooks.java:475)	at org.wso2.carbon.mediator.transform.SmooksMediator.mediate(SmooksMediator.java:123)	at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:77)	at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:47)	at org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:131)	at org.apache.synapse.core.axis2.ProxyServiceMessageReceiver.receive(ProxyServiceMessageReceiver.java:166)	at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180)	at org.apache.axis2.transport.base.AbstractTransportListener.handleIncomingMessage(AbstractTransportListener.java:328)	at org.apache.synapse.transport.vfs.VFSTransportListener.processFile(VFSTransportListener.java:597)	at org.apache.synapse.transport.vfs.VFSTransportListener.scanFileOrDirectory(VFSTransportListener.java:328)	at org.apache.synapse.transport.vfs.VFSTransportListener.poll(VFSTransportListener.java:158)	at org.apache.synapse.transport.vfs.VFSTransportListener.poll(VFSTransportListener.java:107)	at org.apache.axis2.transport.base.AbstractPollingTransportListener$1$1.run(AbstractPollingTransportListener.java:67)	at org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:172)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:724)