Data/services usage

Hi,

I've a flex application which is linked to a Webservice (both are deployed on the same Tomcat server on a single webapp), and time to time, my application "freeze" and I have to restart the tomcat server.

In order to check if it's due to some Webservice operation, I'm using the "test operation" of "Data/services" view: But when I click on test, I receive the following response:

<?xml version="1.0" encoding="UTF-8"?>

<S:Envelope xmlns:S="http://schemas.xmlsoap.org/soap/envelope/">

  <S:Body>

    <ns2:ws_assign_smt_ticketResponse xmlns:ns2="http://services/">

      <return>No response received</return>

    </ns2:ws_assign_smt_ticketResponse>

  </S:Body>

</S:Envelope>

It works with other webservice operation; so, what can be the problem ?