What to do after PHP file generation about xsd2php HOT 5 CLOSED

[17-May-2017 18:33:14 America/New_York] PHP Fatal error:  Uncaught exception 'JMS\Serializer\Exception\XmlErrorException' with message '[FATAL] Specification mandate value for attribute xml
 in  (line: 1, column: 10)' in /home/dev/public_html/application/vendor/jms/serializer/src/JMS/Serializer/XmlDeserializationVisitor.php:84
Stack trace:
#0 /home/dev/public_html/application/vendor/jms/serializer/src/JMS/Serializer/Serializer.php(128): JMS\Serializer\XmlDeserializationVisitor->prepare('<some xml/>')
#1 [internal function]: JMS\Serializer\Serializer->JMS\Serializer\{closure}(Object(JMS\Serializer\XmlDeserializationVisitor))
#2 /home/dev/public_html/application/vendor/phpoption/phpoption/src/PhpOption/Some.php(89): call_user_func(Object(Closure), Object(JMS\Serializer\XmlDeserializationVisitor))
#3 /home/dev/public_html/application/vendor/jms/serializer/src/JMS/Serializer/Serializer.php(132): PhpOption\Some->map(Object(Closure))
#4 /home/dev/public_html/application/controllers/test.php(37): JMS\Serializer\Serializer->deserialize('<some xml/>', 'TestNs\\MyObject', 'xm in /home/dev/public_html/application/vendor/jms/serializer/src/JMS/Serializer/XmlDeserializationVisitor.php on line 84

        $serializerBuilder = SerializerBuilder::create();
        $serializerBuilder->addMetadataDir('/home/dev/public_html/soap/metadata', 'TestNs');
        $serializerBuilder->configureHandlers(function (HandlerRegistryInterface $handler) use ($serializerBuilder) {
            $serializerBuilder->addDefaultHandlers();
            $handler->registerSubscribingHandler(new BaseTypesHandler()); // XMLSchema List handling
            $handler->registerSubscribingHandler(new XmlSchemaDateHandler()); // XMLSchema date handling
        });

        $serializer = $serializerBuilder->build();

        // deserialize the XML into Demo\MyObject object
        $object = $serializer->deserialize('<some xml/>', 'TestNs\MyObject', 'xml');

        // some code ....

        // serialize the Demo\MyObject back into XML
        $newXml = $serializer->serialize($object, 'xml');

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
           xmlns:tns="http://tempuri.org/PurchaseOrderSchema.xsd"
           targetNamespace="http://tempuri.org/PurchaseOrderSchema.xsd"
           elementFormDefault="qualified">
 <xsd:element name="PurchaseOrder" type="tns:PurchaseOrderType"/>
 <xsd:complexType name="PurchaseOrderType">
  <xsd:sequence>
   <xsd:element name="ShipTo" type="tns:USAddress" maxOccurs="2"/>
   <xsd:element name="BillTo" type="tns:USAddress"/>
  </xsd:sequence>
  <xsd:attribute name="OrderDate" type="xsd:date"/>
 </xsd:complexType>

 <xsd:complexType name="USAddress">
  <xsd:sequence>
   <xsd:element name="name"   type="xsd:string"/>
   <xsd:element name="street" type="xsd:string"/>
   <xsd:element name="city"   type="xsd:string"/>
   <xsd:element name="state"  type="xsd:string"/>
   <xsd:element name="zip"    type="xsd:integer"/>
  </xsd:sequence>
  <xsd:attribute name="country" type="xsd:NMTOKEN" fixed="US"/>
 </xsd:complexType>
</xsd:schema>

xsd2php:
  namespaces:
    'http://tempuri.org/PurchaseOrderSchema.xsd': 'TestNs\MyApp'
  destinations_php:
    'TestNs\MyApp': soap2/src
  destinations_jms:
    'TestNs\MyApp': soap2/metadata
  naming_strategy: short # optional and default
  path_generator: psr4 # optional and default