CI SOAP Server Problem

[eluser]abbasmn[/eluser]
here is Hello.wsdl:

Code:

<?xml version="1.0" encoding="UTF-8"?>
<definitions name="MyDefinition"
targetNamespace="urn:myTargetNamespace"
xmlns:tns="urn:myTns"  
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"
>
<message name="myRequest">
  <part name="reqParam" type="xsd:string"/>
</message>
<message name="myResponse">
  <part name="resParam" type="xsd:string"/>
</message>
<portType name="MyPortType">
  <operation name="hello">
   &lt;input message="tns:myRequest"/&gt;
   <output message="tns:myResponse"/>
  </operation>
</portType>
<binding name="MyBinding" type="tns:MyPortType">
  <soap:binding style="rpc"
   transport="http://schemas.xmlsoap.org/soap/http"/>
  <operation name="hello">
   <soap:operation soapAction=""/>
   &lt;input&gt;
    <soap:body use="encoded"
     namespace="urn:myInputNamespace"
     encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"/>
   &lt;/input&gt;
   <output>
    <soap:body use="encoded"
     namespace="urn:myOutputNamespace"
     encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"/>
   </output>
  </operation>
</binding>
<service name="MyService">
  <documentation>Returns a greeting string.
  </documentation>
  <port name="MyPort" binding="tns:MyBinding">
   <soap:address
  location="http://localhost/ws_server/my_server/"/>
  </port>
</service>
</definitions>