Php Boostrap下拉错误：示例域。此域用于文档中的示例

在模板中使用引导下拉列表时，我遇到以下错误：

Example Domain
This domain is for use in illustrative examples in documents. You may use this domain in literature without prior coordination or asking for permission.

我已经试着修复了，但错误仍然是一样的

<nav class="navbar navbar-inverse navbar-fixed-top">
  <div class="container">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand" href="#">Rumah Tahfidz Al-Firdaus</a>
    </div>

    <div id="navbar" class="navbar-collapse collapse">
     <ul class="nav navbar-nav">
        <li class="active"><a href="#">Home</a></li>
        <li><a href="#">About</a></li>
        <li><a href="#">Gallery</a></li>
          <li class="dropdown">
            <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Santri <span class="caret"></span></a>
            <ul class="dropdown-menu">
              <li <?php if ($_GET['module']=='bukutamu') {?>
                class="active" <?php } ?>><a href="?module=bukutamu">Daftar</a></li>
              <li <?php if ($_GET['module']=='tampil') {?>
                class="active" <?php } ?>><a href="?module=tampil">Edit</a></li>
            </ul>
          </li>
        </ul>
      <form class="navbar-form navbar-right">
        <ul class="nav navbar-nav">
        </ul>   
        <div class="form-group">
          <input type="text" placeholder="Email" class="form-control">
        </div>
        <div class="form-group">
          <input type="password" placeholder="Password" class="form-control">
        </div>
        <button type="submit" class="btn btn-success">Sign in</button>
      </form>
    </div><!--/.navbar-collapse -->
  </div>
</nav>

<!-- Main jumbotron for a primary marketing message or call to action -->


<!-- /container -->


<!-- Bootstrap core JavaScript
================================================== -->
<!-- Placed at the end of the document so the pages load faster -->
<script src="https://code.jquery.com/jquery-1.12.4.min.js" integrity="sha384-nvAa0+6Qg9clwYCGGPpDQLVpLNn0fRaROjHqs13t4Ggj3Ez50XnGQqc/r8MhnRDZ" crossorigin="anonymous"></script>
<script>window.jQuery || document.write('<script src="../../assets/js/vendor/jquery.min.js"><\/script>')</script>
<script src="../../dist/js/bootstrap.min.js"></script>
<!-- IE10 viewport hack for Surface/desktop Windows 8 bug -->
<script src="../../assets/js/ie10-viewport-bug-workaround.js"></script>

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