It looks like this is a web page, not a feed. I looked for a feed associated with this page, but couldn't find one. Please enter the address of your feed to validate.

Source: http://www.nicovideo.jp/myvideo/5156695?rss=2.0

  1. <!DOCTYPE html>
  2. <html lang="ja-jp">
  3.  
  4. <head>
  5.  
  6.    <meta charset="utf-8">
  7.    <meta name="copyright" content="&copy; DWANGO Co., Ltd.">
  8.    <link rel="shortcut icon" href="https://resource.video.nimg.jp/uni/images/favicon/favicon.ico?re"><link rel="icon" type="image/png" href="https://resource.video.nimg.jp/uni/images/favicon/32.png?re" sizes="32x32"><link rel="icon" type="image/png" href="https://resource.video.nimg.jp/uni/images/favicon/48.png?re" sizes="48x48"><link rel="icon" type="image/png" href="https://resource.video.nimg.jp/uni/images/favicon/96.png?re" sizes="96x96"><link rel="icon" type="image/png" href="https://resource.video.nimg.jp/uni/images/favicon/144.png?re" sizes="144x144">
  9.  
  10.    <title>ニコニコ</title>
  11.  
  12.    <meta name="msapplication-task" content="name=ニコニコ; action-uri=https://www.nicovideo.jp/; icon-uri=https://resource.video.nimg.jp/uni/img/favicon.ico?re">
  13.    <meta property="fb:app_id" content="378853695459932">
  14.  
  15.    
  16.  
  17.    
  18.  
  19.    
  20.          
  21.  
  22.    
  23.        <script>
  24.      window.Ads = { protocol: 'https:' };
  25.    </script>
  26.  
  27.        <style>
  28.              [data-show-hrc] {
  29.          display: none !important;
  30.        }
  31.          </style>
  32.  
  33.    
  34.  <link href="https://resource.video.nimg.jp/uni/styles/bundle/pages_message_MessagePage.css?1716428870" rel="stylesheet">
  35.  
  36.    
  37.  
  38. </head>
  39. <body class="BaseLayout ja-jp ">
  40.  
  41.  
  42.    <div id="CommonHeader" class="CommonHeader" data-common-header="{&quot;initConfig&quot;:{&quot;frontendId&quot;:6,&quot;frontendVersion&quot;:&quot;0&quot;,&quot;site&quot;:&quot;niconico&quot;,&quot;debug&quot;:{&quot;showAppeal&quot;:false},&quot;baseUrl&quot;:{&quot;accountUrl&quot;:&quot;https:\/\/account.nicovideo.jp&quot;,&quot;channelUrl&quot;:&quot;https:\/\/ch.nicovideo.jp&quot;,&quot;communityUrl&quot;:&quot;https:\/\/com.nicovideo.jp&quot;,&quot;nicoadUrl&quot;:&quot;https:\/\/nicoad.nicovideo.jp&quot;,&quot;niconicoUrl&quot;:&quot;https:\/\/www.nicovideo.jp&quot;},&quot;customization&quot;:{&quot;cmnhdRef&quot;:{&quot;page&quot;:&quot;myvideo&quot;},&quot;nextUrl&quot;:&quot;\/myvideo\/5156695?rss=2.0&quot;,&quot;logoutNextUrl&quot;:&quot;\/&quot;,&quot;size&quot;:{&quot;hMargin&quot;:&quot;auto&quot;,&quot;hPadding&quot;:&quot;22px&quot;,&quot;maxWidth&quot;:&quot;none&quot;,&quot;minWidth&quot;:&quot;1024px&quot;},&quot;userPanelServiceLinks&quot;:[{&quot;href&quot;:&quot;https:\/\/www.nicovideo.jp\/my\/mylist&quot;,&quot;label&quot;:&quot;\u30de\u30a4\u30ea\u30b9\u30c8&quot;},{&quot;href&quot;:&quot;https:\/\/www.nicovideo.jp\/my\/follow&quot;,&quot;label&quot;:&quot;\u30d5\u30a9\u30ed\u30fc\u4e2d&quot;},{&quot;href&quot;:&quot;https:\/\/www.nicovideo.jp\/ranking&quot;,&quot;label&quot;:&quot;\u52d5\u753b\u30e9\u30f3\u30ad\u30f3\u30b0&quot;},{&quot;href&quot;:&quot;https:\/\/live.nicovideo.jp\/ranking&quot;,&quot;label&quot;:&quot;\u751f\u653e\u9001\u30e9\u30f3\u30ad\u30f3\u30b0&quot;},{&quot;href&quot;:&quot;https:\/\/www.nicovideo.jp\/my\/history\/video&quot;,&quot;label&quot;:&quot;\u52d5\u753b\u8996\u8074\u5c65\u6b74&quot;},{&quot;href&quot;:&quot;https:\/\/live.nicovideo.jp\/timetable&quot;,&quot;label&quot;:&quot;\u751f\u653e\u9001\u756a\u7d44\u8868&quot;},{&quot;href&quot;:&quot;https:\/\/www.upload.nicovideo.jp\/niconico-garage\/video\/videos\/upload&quot;,&quot;label&quot;:&quot;\u52d5\u753b\u3092\u6295\u7a3f\u3059\u308b&quot;},{&quot;href&quot;:&quot;https:\/\/live.nicovideo.jp\/create&quot;,&quot;label&quot;:&quot;\u653e\u9001\u3059\u308b&quot;}],&quot;userPanelServiceLinksLabel&quot;:&quot;\u30cb\u30b3\u30cb\u30b3\u7dcf\u5408\u30e1\u30cb\u30e5\u30fc&quot;},&quot;user&quot;:{&quot;isLogin&quot;:false}},&quot;commonHeaderBaseUrl&quot;:&quot;https:\/\/common-header.nimg.jp&quot;}"></div>
  43.  
  44.    
  45.  <div class="BaseLayout-main">
  46.    
  47.  <div class="MessagePage">
  48.    <div class="MessagePage-header">
  49.      
  50.        <div class="HeaderContainer HeaderContainer_light ">
  51.    <div class="HeaderContainer-content">
  52.    <div class="HeaderContainer-main">
  53.            
  54.      <div class="HeaderContainer-mainUpper">
  55.                          <div class="LogoContainer">
  56.  <h1 class="NiconicoLogo NiconicoLogo_er NiconicoLogo_black"><a href="/">ニコニコ</a></h1>
  57. </div>
  58.        
  59.                <div
  60.  class="SearchContainer"
  61.    data-suggest-api-url="https://sug.search.nicovideo.jp/"
  62. >
  63.  <div class="CrossSearch"><ul class="CrossSearch-rowSelector"><li class="CrossSearch-rowService active" data-service="video" data-base-url="https://www.nicovideo.jp/search/">動画</li><li class="CrossSearch-rowService" data-service="seiga" data-base-url="https://seiga.nicovideo.jp/search/">静画</li><li class="CrossSearch-rowService" data-service="live" data-base-url="https://live.nicovideo.jp/search/">生放送</li></ul><div class="CrossSearch-pullDownSelector"><button class="CrossSearch-pullDownButton"><div class='CrossSearch-pullDownButtonText'>動画</div><div class='CrossSearch-arrowIcon'></div></button><ul class="CrossSearch-pullDownList" style="display: none"><li class="CrossSearch-pullDownService" data-service="video" style="display: none">動画</li><li class="CrossSearch-pullDownService" data-service="seiga">静画</li><li class="CrossSearch-pullDownService" data-service="live">生放送</li></ul></div><form action="" class="CrossSearch-form"><input type="text" class="CrossSearch-input" name="CrossSearch-input" placeholder="動画を検索"><button type="submit" class="CrossSearch-button"></button></form></div>
  64. </div>
  65.      </div>
  66.  
  67.      
  68.                </div>
  69.  
  70.    <div class="HeaderContainer-ad">
  71.            <div class="PcUniTop468x60NorthAdContainer">
  72.  <div id="pc_uni_top_468x60_north" class="Ads">
  73.      <div class="PcUniTop468x60NorthAdContainer-skeleton"></div>
  74.  
  75. </div>
  76. </div>
  77.    </div>
  78.  </div>
  79. </div>
  80.      
  81.    </div>
  82.    <script type="text/javascript">
  83.      document.write('<img src="https://www.nicovideo.jp/api/ria/log.gif?t=' + String(new Date().getTime()) + '&from=nvweb&name=MessageViewLog">');
  84.    </script>
  85.    <div class="MessagePage-contents">
  86.                    <h2>ページが見つかりません</h2>
  87.        <p>お探しのページは、すでに削除されたか存在しない可能性があります。</p>
  88.        <p>アドレスが間違っていないか、ご確認ください。</p>
  89.  
  90.                  </div>
  91.    <div class="MessagePage-debugContainer">
  92.          </div>
  93.  </div>
  94.  
  95.  </div>
  96.  
  97.  <div class="BaseLayout-footer">
  98.    
  99.        <footer class="FooterContainer">
  100.  <div class="FooterContainer-inner">
  101.    <div class="FooterContainer-contents">
  102.      <div class="FooterContainer-title">ニコニコについて</div>
  103.      <div class="FooterContainer-list">
  104.        <a href="https://site.nicovideo.jp/service_list/?ref=footer">サービス一覧</a>
  105.        <a href="https://www.nicovideo.jp/rss?ref=footer">RSS(更新情報)一覧</a>
  106.        <a href="https://license-search.nicovideo.jp/">動画・生放送に使用できる音源の検索</a>
  107.        <a href="https://site.nicovideo.jp/base/declaration?ref=footer">宣言</a>
  108.        <a href="https://site.nicovideo.jp/term/?ref=footer">サイトご利用にあたって</a>        <a href="http://info.nicovideo.jp/base/phishing.html?ref=footer">フィッシング詐欺にご注意</a>                <a href="https://dwango.co.jp/">運営会社</a>
  109.      </div>
  110.    </div>
  111.    <div class="FooterContainer-contents">
  112.      <div class="FooterContainer-title">お問い合わせ</div>
  113.      <div class="FooterContainer-list">
  114.        <a href="https://qa.nicovideo.jp/?ref=footer">総合ヘルプ</a>
  115.        <a href="https://qa.nicovideo.jp/faq/show/5008?site_domain=default">ご意見・ご要望</a>
  116.        <a href="https://qa.nicovideo.jp/faq/show/15833?site_domain=default">不具合報告</a>
  117.        <a href="http://rcp-smile.nicovideo.jp/static/rule/">権利者法人の皆様へ</a>
  118.        <a href="https://ch.nicovideo.jp/start?ref=footer">チャンネル開設</a>
  119.        <a href="https://site.nicovideo.jp/sales_ads/ad_product?ref=footer">広告出稿</a>
  120.        <a href="https://dwango.co.jp/contact/">取材・プレス</a>
  121.        <a href="https://dwango.co.jp/recruit/">採用情報</a>
  122.      </div>
  123.    </div>
  124.  
  125.        
  126.    <div class="FooterContainer-dwango">&copy;DWANGO Co., Ltd.</div>
  127.    <ul class="FooterContainer-licenses">
  128.      <li class="FooterContainer-license">
  129.        <div class="FooterContainer-logoNexTone"></div>
  130.        <p class="FooterContainer-licenseMeta">
  131.          NexTone​許諾番号<br>
  132.          ID000001829
  133.        </p>
  134.      </li>
  135.      <li class="FooterContainer-license">
  136.        <div class="FooterContainer-logoJasrac"></div>
  137.        <p class="FooterContainer-licenseMeta">
  138.          JASRAC許諾番号<br>
  139.          9013388001Y45123
  140.        </p>
  141.      </li>
  142.    </ul>
  143.  </div>
  144. </footer>
  145.  </div>
  146.  
  147.  
  148.  <script type="text/javascript" charset="utf-8" src="https://res.ads.nicovideo.jp/assets/js/ads2.js?ref=www"></script>
  149.  <script charset="utf-8" src="https://resource.video.nimg.jp/uni/scripts/bundle/vendor.js?1716428870" ></script>
  150.  
  151.  
  152.  <script charset="utf-8" src="https://resource.video.nimg.jp/uni/scripts/bundle/pages_message_MessagePage.js?1716428870" ></script>
  153.  
  154.  
  155. </body>
  156. </html>
  157.  
Copyright © 2002-9 Sam Ruby, Mark Pilgrim, Joseph Walton, and Phil Ringnalda