Make a Website: Bootstrap #7 Code Not Working


#1
<!DOCTYPE html>
<html>

  <head>
    <link href="http://s3.amazonaws.com/codecademy-content/courses/ltp/css/shift.css" rel="stylesheet">
    
    <link rel="stylesheet" href="http://s3.amazonaws.com/codecademy-content/courses/ltp/css/bootstrap.css">
    <link rel="stylesheet" href="main.css">
    
  </head>

  <body>
    <div class="nav">
      <div class="container">
      <div class="row">
      <div class="col-md-4">
        <ul class="pull-left">
          <li><a href="#">Name</a></li>
          <li><a href="#">Browse</a></li>
        </ul>
        <div class="col-md-4">
        <ul class="pull-right">
          <li><a href="#">Sign Up</a></li>
          <li><a href="#">Log In</a></li>
          <li><a href="#">Help</a></li>
        </ul>
        <div class="col-md-4">
        </div>
      </div>
    </div>

    <div class="jumbotron">
      <div class="container">
        <h1>Find a place to stay.</h1>
        <p>Rent from people in over 34,000 cities and 192 countries.</p>
        <a href="#">Learn More</a>
      </div>
    </div> 
<div class="neighborhood-guides">
    <div class="container">
        <h2>Neighborhood Guides</h2>
        <p>Not sure where to stay? We've created neighborhood guides for cities all around the world.</p>
        <div class="row">
        
            <div class="col-md-4">
            <div class="thumbnail">
      <img src="http://goo.gl/0sX3jq" >
    </div>
    <div class="thumbnail">
      <img src="http://goo.gl/an2HXY" >
    </div>
    <div class="col-md-4">
    <div class="thumbnail">
      <img src="http://goo.gl/Av1pac" >
    </div>
    <div class="thumbnail">
      <img src="http://goo.gl/vw43v1">
    </div>
  </div>
             <div class="col-md-4">
    <div class="thumbnail">
      <img src="http://goo.gl/0Kd7UO" >
    </div>
  </div>
  </div>
    <div class="learn-more">
	  <div class="container">
		<div>
	      <div>
			<h3>Travel</h3>
			<p>From apartments and rooms to treehouses and boats: stay in unique spaces in 192 countries.</p>
			<p><a href="#">See how to travel on Airbnb</a></p>
	      </div>
		  <div>
			<h3>Host</h3>
			<p>Renting out your unused space could pay your bills or fund your next vacation.</p>
			<p><a href="#">Learn more about hosting</a></p>
		  </div>
		  <div>
			<h3>Trust and Safety</h3>
			<p>From Verified ID to our worldwide customer support team, we've got your back.</p>
			<p><a href="#">Learn about trust at Airbnb</a></p>
		  </div>
	    </div>
	  </div>
	</div>
  </body>
</html>

Is not accepted and saying Oops, try again. Add a <div class="thumbnail">..</div>


#2

There shouldn't be any rows or columns in your nav div.

Your first column is missing its closing tag.