Как работать с МВт представить кормить в C#

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Здравствуйте, я пытаюсь загрузить продукт через mws Submitfeed с помощью C# VS2017.
Я столкнулся с этой ошибкой.

Фатальная ошибка синтаксического анализа XML в строке 23, столбец 15: cvc-complex-type.4: атрибут 'unitOfMeasure' должен появиться на элементе 'Length'. cvc-комплексный тип.4: атрибут 'unitOfMeasure' должен появиться на элементе 'Length'

Что я уже пробовал:

XML-канал это:

  1  <amazonenvelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  2    
  3      <documentversion>1.01
  4      <merchantidentifier>A22RO79OS4OIEE
  5    
  6    <messagetype>Product
  7    <purgeandreplace>false
  8    <message>
  9      <messageid>1
 10      <operationtype>Update
 11      <product>
 12        <sku>BGS-2111 Black 8oz
 13        <standardproductid>
 14          <type>EAN
 15          <value>8971227095747
 16        
 17        <producttaxcode>A_GEN_NOTAX
 18        <descriptiondata>
 19          <title>BOXING GLOVES "SUPREME"
 20          <brand>Greenhill
 21          <description>Product description.
 22          <bulletpoint>MADE OF COWHIDE LEATHER
 23          <bulletpoint>For Training
 24          <msrp currency="EUR">25.19
 25          <manufacturer>Greenhill
 26          <itemtype>Gloves
 27        
 28        <productdata>
 29          <sports>
 30            <producttype>
 31              <sportsmisc>
 32                <value>Gloves
 33                <directions>Use Carefully

и код C# это:

{
SubmitFeedRequest request = new SubmitFeedRequest();
                request.Merchant = merchantId;
                request.MWSAuthToken = "amzn.mws.82a5d9b7-0376-ed71-de61-b9ffdae2d926"; // Optional
                request.MarketplaceIdList = new IdList();
                request.MarketplaceIdList.Id = new List<string>(new string[] { marketplaceId });

                // MWS exclusively offers a streaming interface for uploading your feeds. This is because 
                // feed sizes can grow to the 1GB+ range - and as your business grows you could otherwise 
                // silently reach the feed size where your in-memory solution will no longer work, leaving you 
                // puzzled as to why a solution that worked for a long time suddenly stopped working though 
                // you made no changes. For the same reason, we strongly encourage you to generate your feeds to 
                // local disk then upload them directly from disk to MWS.

                request.FeedContent = File.Open("P1.xml", FileMode.Open, FileAccess.Read);

                //Calculating the MD5 hash value exhausts the stream, and therefore we must either reset the
                // position, or create another stream for the calculation.
                request.ContentMD5 = MarketplaceWebServiceClient.CalculateContentMD5(request.FeedContent);
                request.FeedContent.Position = 0;

                request.FeedType = "_POST_PRODUCT_DATA_";

                SubmitFeedSample.InvokeSubmitFeed(service, request);
}

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