There is an error in XML document (2, 2).

<?xml version="1.0" encoding="utf-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata"
        targetNamespace="http://www.w3schools.com" elementFormDefault="qualified">
  <xs:element name="CASES" >
    <xs:complexType>
      <xs:choice minOccurs="0" maxOccurs="unbounded">
        <xs:element name="CASE">
          <xs:complexType>
            <xs:sequence>
              <xs:element name="RECEIVED_DATE" type="xs:string" minOccurs="0" />
              <xs:element name="DIVISION_CODE" type="xs:string" minOccurs="0" />
              <xs:element name="LOCATION_CODE" type="xs:string" minOccurs="0" />
              <xs:element name="LOCATION_NAME" type="xs:string" minOccurs="0" />
              <xs:element name="LOCATION_ADDRESS1" type="xs:string" minOccurs="0" />
              <xs:element name="PARTIES" minOccurs="0" maxOccurs="unbounded">
                <xs:complexType>
                  <xs:sequence>
                    <xs:element name="PARTY" minOccurs="0" maxOccurs="unbounded">
                      <xs:complexType>
                        <xs:sequence>
                          <xs:element name="FIRST_NAME" type="xs:string" minOccurs="0" msdata:Ordinal="0" />
                          <xs:element name="LAST_NAME" type="xs:string" minOccurs="0" msdata:Ordinal="1" />
                        </xs:sequence>
                        <xs:attribute name="TYPE_DESCRIPTION" type="xs:string" />
                      </xs:complexType>
                    </xs:element>
                  </xs:sequence>
                </xs:complexType>
              </xs:element>
            </xs:sequence>
          </xs:complexType>
        </xs:element>
      </xs:choice>
    </xs:complexType>
  </xs:element>
</xs:schema>

StreamReader reader = new StreamReader(_myXmlPath);
XmlSerializer serializer = new XmlSerializer(typeof(CASES));
CASES myCases = (CASES)serializer.Deserialize(reader);   //error occure