如何解决故障代码：soapenv：SOAP中字符串未知的服务器

Question

我正在开发SOAP Web服务。我正在以下列形式发送请求

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:q0="http://gramenerit.com/BankService/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<soapenv:Body>
   <q0:XYZDetails>
       <field name="abc">1001121</field> 
  </q0:XYZDetails>
</soapenv:Body>
</soapenv:Envelop>

但作为回应我遇到了错误

<soapenv:Body>
 <soapenv:Fault>
   <faultcode>soapenv:Server</faultcode> 
   <faultstring>unknown</faultstring> 
   <detail /> 
</soapenv:Fault>

我的回复类型xsd是

<xsd:element name="XYZResponse">
    <xsd:complexType>
      <xsd:sequence>
        <xsd:element name="xyz_response" maxOccurs="unbounded" minOccurs="0">
          <xsd:complexType>
            <xsd:simpleContent>
              <xsd:extension base="xsd:string">
                <xsd:attribute type="xsd:string" name="name" use="optional"/>
              </xsd:extension>
            </xsd:simpleContent>
          </xsd:complexType>
        </xsd:element>
      </xsd:sequence>
    </xsd:complexType>
  </xsd:element>

我检查了服务器日志，但没有显示任何错误。如何解决？