WSDL Excerpt that causes Exception

api2.wsdl

<?xml version="1.0" encoding="UTF-8"?>
<definitions xmlns="http://schemas.xmlsoap.org/wsdl/" name="SevOneApi" targetNamespace="http://www.sevone.com/" xmlns:tns="http://www.sevone.com/" xmlns:impl="http://www.sevone.com/" xmlns:xsd1="http://www.sevone.com/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/">
  <types>
    <schema xmlns="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.sevone.com/">
      <xsd:import namespace="http://schemas.xmlsoap.org/soap/encoding/" schemaLocation="http://schemas.xmlsoap.org/soap/encoding/" />
      <complexType name="SO_Unit">
        <sequence>
          <element name="id" type="xsd:integer"/>
          <element name="name" type="xsd:string"/>
          <element name="abbreviation" type="xsd:string"/>
          <element name="isConversion" type="xsd:integer"/>
          <element name="conversionBase" type="xsd:string"/>
          <element name="conversionOperation" type="xsd:string"/>
        </sequence>
      </complexType>
    </schema>
  </types>
  <portType name="SevOneApiPortType">
    <operation name="unit_getUnits">
      <input message="tns:Unit_getUnitsRequest"/>
      <output message="tns:Unit_getUnitsResponse"/>
    </operation>
  </portType>
  <binding name="SevOneApiBinding" type="tns:SevOneApiPortType">
    <soap:binding style="rpc" transport="http://schemas.xmlsoap.org/soap/http"/>
    <operation name="unit_getUnits">
      <soap:operation soapAction="urn:SevOneApi#SevOneApiServer#unit_getUnits"/>
      <input>
        <soap:body use="encoded" namespace="http://www.sevone.com/" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"/>
      </input>
      <output>
        <soap:body parts="return" use="encoded" namespace="http://www.sevone.com/" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"/>
      </output>
    </operation>
  </binding>
  <message name="Unit_getUnitsRequest"/>
  <message name="Unit_getUnitsResponse">
    <part name="return" type="tns:ArrayOfSO_Unit"/>
  </message>
  <service name="SevOneApiService">
    <port name="SevOneApiPort" binding="tns:SevOneApiBinding">
      <soap:address location="http://192.168.32.12/soap3/api.php"/>
    </port>
  </service>
</definitions>