Getlist Items Returning Balnk values

I am unsing call webservice with get list items with following input

URL : Web Url/_vti_bin/lists.asmx

Editor Mode - SOAP Editor

WebMethod - GetListItems

SOAP Editor 

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
    <soap:Body>
        <GetListItems xmlns="http://schemas.microsoft.com/sharepoint/soap/">
            <listName>{8d42b4cb-c500-4e1b-a1b4-025c8615d2e7}</listName>
            <viewName></viewName>
           <Query>

     <Where><Eq><FieldRef Name="Opening_x0020_Status" />

<Value Type="Text">Active</Value></Eq></Where></Query>

<ViewFields>

<FieldRef Name="Task_x0020_Order" />

<FieldRef Name="Task_x0023_" />

<FieldRef Name="Hiring_x0020_Manager" />

<FieldRef Name="Manager_x0020_Phone" />

</ViewFields>

         <rowLimit></rowLimit>
            <queryOptions></queryOptions>
            <webID></webID>
        </GetListItems>
    </soap:Body>
</soap:Envelope>

Store the output in the string variable.

The string variable is always blank - Any Idea whats wrong with the SOAP

This is retuning