title: ERROR {org.apache.synapse.mediators.transform.XSLTMediator} - Unable to perform XSLT transformation
body: <p>I am trying to to do a sample provided in this <a href="http://wso2.org/library/articles/2011/04/integrate-rules-soa" rel="nofollow noreferrer">url</a> , but i am getting error from xslt as:</p>
  
  <pre><code>TID: [0] [ESB] [2013-02-25 13:08:55,280] 
  ERROR {org.apache.synapse.mediators.transform.XSLTMediator} -  Unable to perform XSLT transformation using : Value {name ='null', keyValue ='conf:/repository/synapse/default/local-entries/CustomerOrderInputTransfer.xslt'} 
  against source XPath : s11:Body/child::*[position()=1] | s12:Body/child::*[position()=1] {org.apache.synapse.mediators.transform.XSLTMediator}
  
  org.apache.synapse.SynapseException: Error creating XSLT transformer using : Value {name ='null', keyValue ='conf:/repository/synapse/default/local-entries/CustomerOrderInputTransfer.xslt'}
      at org.apache.synapse.mediators.AbstractMediator.handleException(AbstractMediator.java:293)
      at org.apache.synapse.mediators.transform.XSLTMediator.createTemplate(XSLTMediator.java:389)
      at org.apache.synapse.mediators.transform.XSLTMediator.performXSLT(XSLTMediator.java:232)
      at org.apache.synapse.mediators.transform.XSLTMediator.mediate(XSLTMediator.java:191)
      at org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:60)
      at org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:114)
      at org.apache.synapse.core.axis2.ProxyServiceMessageReceiver.receive(ProxyServiceMessageReceiver.java:144)
      at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:181)
      at org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest(HTTPTransportUtils.java:172)
      at org.apache.synapse.transport.nhttp.ServerWorker.processEntityEnclosingMethod(ServerWorker.java:416)
      at org.apache.synapse.transport.nhttp.ServerWorker.run(ServerWorker.java:268)
      at org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:172)
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
      at java.lang.Thread.run(Thread.java:722)
  Caused by: org.apache.synapse.SynapseException: Cannot convert null to a StreamSource
      at org.apache.synapse.config.SynapseConfigUtils.handleException(SynapseConfigUtils.java:576)
      at org.apache.synapse.config.SynapseConfigUtils.getStreamSource(SynapseConfigUtils.java:77)
      at org.apache.synapse.mediators.transform.XSLTMediator.createTemplate(XSLTMediator.java:379)
      ... 13 more
  TID: [0] [ESB] [2013-02-25 13:08:55,282]  WARN {org.apache.synapse.core.axis2.ProxyServiceMessageReceiver} -  Exception encountered but no fault handler found - message dropped {org.apache.synapse.core.axis2.ProxyServiceMessageReceiver}
  </code></pre>
  
  <p>I am clueless about how to rectify this bug. Plz help</p>