在WSDL中找不到任何可用的绑定服务

我正在尝试使用Kohana和PHP的SoapServer（）类来服务SOAP请求（QIWI支付系统）。

所以我得到了PHP致命错误，说"SOAP-error:解析WSDL：在WSDL中找不到任何可用的绑定服务。"

我的发球脚本是：

$s = new SoapServer(DOCROOT.'wsdls/IShopClientWS.wsdl');

我的WSDL文件位于http://mysite.url/wsdls/IShopClientWS.wsdl

它的内容是：

        <?xml version="1.0" encoding="UTF-8"?>
<wsdl:definitions name="IShopClientWSService" targetNamespace="http://client.ishop.mw.ru/" xmlns:tns="http://client.ishop.mw.ru/" xmlns:soap12="http://schemas.xmlsoap.org/wsdl/soap12/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/">
  <wsdl:types>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:tns="http://client.ishop.mw.ru/" attributeFormDefault="unqualified" elementFormDefault="unqualified" targetNamespace="http://client.ishop.mw.ru/">
    <xs:element name="updateBill" type="tns:updateBill"/>
    <xs:element name="updateBillResponse" type="tns:updateBillResponse"/>
    <xs:complexType name="updateBill">
        <xs:sequence>
            <xs:element minOccurs="0" name="login" type="xs:string"/>
            <xs:element minOccurs="0" name="password" type="xs:string"/>
            <xs:element minOccurs="0" name="txn" type="xs:string"/>
            <xs:element name="status" type="xs:int"/>
        </xs:sequence>
    </xs:complexType>
    <xs:complexType name="updateBillResponse">
        <xs:sequence>
            <xs:element name="updateBillResult" type="xs:int"/>
        </xs:sequence>
    </xs:complexType>
    <xs:element name="updateBillExt" type="tns:updateBillExt"/>
    <xs:element name="updateBillExtResponse" type="tns:updateBillExtResponse"/>
    <xs:complexType name="Param">
        <xs:sequence>
            <xs:element name="name" nillable="false" type="xsd:string"/>
            <xs:element name="value" nillable="false" type="xsd:string"/>
        </xs:sequence>
    </xs:complexType>
    <xs:complexType name="ArrayOfParams">
        <xs:sequence>
            <xs:element maxOccurs="unbounded" minOccurs="0" name="item" type="tns:Param"/>
        </xs:sequence>
    </xs:complexType>
    <xs:complexType name="updateBillExt">
        <xs:sequence>
            <xs:element minOccurs="0" name="login" type="xs:string"/>
            <xs:element minOccurs="0" name="password" type="xs:string"/>
            <xs:element minOccurs="0" name="txn" type="xs:string"/>
            <xs:element name="status" type="xs:int"/>
        <xs:element name="params" nillable="false" type="tns:ArrayOfParams"/>
        </xs:sequence>
    </xs:complexType>
    <xs:complexType name="updateBillExtResponse">
        <xs:sequence>
            <xs:element name="updateBillExtResult" type="xs:int"/>
        </xs:sequence>
    </xs:complexType>
</xs:schema>
  </wsdl:types>
  <wsdl:message name="updateBillResponse">
    <wsdl:part name="parameters" element="tns:updateBillResponse">
    </wsdl:part>
  </wsdl:message>
  <wsdl:message name="updateBill">
    <wsdl:part name="parameters" element="tns:updateBill">
    </wsdl:part>
  </wsdl:message>
  <wsdl:message name="updateBillExtResponse">
    <wsdl:part name="parameters" element="tns:updateBillExtResponse">
    </wsdl:part>
  </wsdl:message>
  <wsdl:message name="updateBillExt">
    <wsdl:part name="parameters" element="tns:updateBillExt">
    </wsdl:part>
  </wsdl:message>
  <wsdl:portType name="IShopClientWS">
    <wsdl:operation name="updateBill">
      <wsdl:input name="updateBill" message="tns:updateBill">
    </wsdl:input>
      <wsdl:output name="updateBillResponse" message="tns:updateBillResponse">
    </wsdl:output>
    </wsdl:operation>
    <wsdl:operation name="updateBillExt">
      <wsdl:input name="updateBillExt" message="tns:updateBillExt">
    </wsdl:input>
      <wsdl:output name="updateBillExtResponse" message="tns:updateBillExtResponse">
    </wsdl:output>
    </wsdl:operation>
  </wsdl:portType>
  <wsdl:binding name="IShopClientWSBinding" type="tns:IShopClientWS">
    <soap12:binding style="document" transport="http://www.w3.org/2003/05/soap/bindings/HTTP/"/>
    <wsdl:operation name="updateBill">
      <soap12:operation soapAction="updateBill" style="document"></soap12:operation>
      <wsdl:input name="updateBill">
        <soap12:body use="literal"/>
      </wsdl:input>
      <wsdl:output name="updateBillResponse">
        <soap12:body use="literal"/>
      </wsdl:output>
    </wsdl:operation>
    <wsdl:operation name="updateBillExt">
      <soap12:operation soapAction="updateBillExt" style="document"/>
      <wsdl:input name="updateBillExt">
        <soap12:body use="literal"/>
      </wsdl:input>
      <wsdl:output name="updateBillExtResponse">
        <soap12:body use="literal"/>
      </wsdl:output>
    </wsdl:operation>
  </wsdl:binding>
  <wsdl:service name="IShopClientWSServiceService">
    <wsdl:port name="IShopClientWSPort" binding="tns:IShopClientWSBinding">
      <soap12:address location="https://mysite.url/path_to_serving_script"></soap12:address>
    </wsdl:port>
  </wsdl:service>
</wsdl:definitions>

由于PHP-SOAP源文件位于http://lxr.sweon.net/php/http/source/ext/soap/php_sdl.c:

if (ctx.sdl->bindings == NULL || ctx.sdl->bindings->nNumOfElements == 0) {
                 soap_error0(E_ERROR, "Parsing WSDL: Could not find any usable binding services in WSDL.");
}

那么，我的WSDL文件出了什么问题？

如果有任何帮助，我们将不胜感激！