XPath doesnt work probably??

Hi all,
hope someone can Help me solving my Problem with getting the right XPath for a special case in my GroovyScript Test Step.
After calling the Request and gettin a Response i got the GroovyScript Test Step.
I try to Check if there appears this ErrorMsg("Nothing in there.") and do something then.
I tried nearly every possible XPath for //SOAP-ENV:Fault/detail/CommandCustomerDataRequestFailure/errorMsg but cant it.
Log.info with this Path gives me a Null Message.

I have this SOAP-Response in ErrorCase:
------------------------------

<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
  <SOAP-ENV:Header/>
   <SOAP-ENV:Body>
      <SOAP-ENV:Fault>
         <faultcode>SOAP-ENV:Server</faultcode>
         <faultstring xml:lang="en">FaultMsg</faultstring>
         <detail>
            <CommandCustomerDataRequestFailure xmlns="http://XXX/YY">
               <ads>401413</ads>
               <port>0-1-5</port>
               <errorMsg>Nothing in there.</errorMsg>
            </CommandCustomerDataRequestFailure>
         </detail>
      </SOAP-ENV:Fault>
   </SOAP-ENV:Body>
</SOAP-ENV:Envelope>

-----------------------------------
Groovy:
------------------------------------

//all the def stuff
def groovyUtils = new com.eviware.soapui.support.GroovyUtils( context )
def holder = groovyUtils.getXmlHolder( "Request1#Response" )
}
def getResponseFilename(name) {
  date = new Date()
  dateFormat = new java.text.SimpleDateFormat('yyyyMMdd-kkmmssms')
  shortDate = dateFormat.format(date)
  respFilename = shortDate + "-" + name + "-response.xml"
}
// closure referes to Drucken.call
def Drucken ={
....
....
....
....
}
//if-else content
if (context.expand('${Request1#Response#//SOAP-ENV:Fault/detail/CommandCustomerDataRequestFailure/errorMsg')=="Nothing in there.")
     {
     Drucken.call( 'C:/nothingthere' )
     log.info "Nothing there"
     }
     else
      {
      Drucken.call( 'C:/!Error' )
      log.info "Error"
      }

---------------------------------
I use soapUI 3.6.1 non-pro.