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我正在从Code4Startup学习Ruby on Rails。这段代码是从完整的代码中复制而来的，您可以在下面进行检查。该代码部分引起一个错误：错误 - Ruby On Rails - 语法错误，意外的keyword_ensure，期待输入结束
“语法错误，意想不到keyword_ensure，期待结束输入”
“提取的源（围绕线＃104）： 102” </HTML>”
<ul class="side-nav" id="mobile-demo">
<li><a href="#">Courses</a></li>
<li><%= link_to "Sign Up", new_user_registration_path %></li>
<li><%= link_to "Login", new_user_session_path %></li>
<!-- Dropdown Trigger -->
<li><a class="dropdown-button" href="#!" data-activates="dropdown2"><%= current_user.email %> <i class="mdi-navigation-arrow-drop-down right"></i></a></li>
<% end %>
</ul>
现在，如果我删除此代码，它的工作原理。我不知道什么是错的，或者即使这段代码是影响代码的其他部分。
完整代码
<!DOCTYPE html>
<html>
<head>
<title>Code4Pro</title>
<%= stylesheet_link_tag 'application', media: 'all', 'data-turbolinks-track' => true %>
<%= javascript_include_tag 'application', 'data-turbolinks-track' => true %>
<%= csrf_meta_tags %>
</head>
<body>
<!-- Dropdown Structure -->
<ul id="dropdown1" class="dropdown-content">
<li><a href="#!">My Profile</a></li>
<li><a href="#!">My Courses</a></li>
<li class="divider"></li>
<li><%= link_to "Log out", destroy_user_session_path, method: :delete %></li>
</ul>
<ul id="dropdown2" class="dropdown-content">
<li><a href="#!">My Profile</a></li>
<li><a href="#!">My Courses</a></li>
<li class="divider"></li>
<li><%= link_to "Log out", destroy_user_session_path, method: :delete %></li>
</ul>
<header>
<nav class="brown lighten-4 z-depth-2">
<div class="container">
<div class="nav-wrapper">
<a href="#!" class="brand-logo">Code4Pro</a>
<a href="#" data-activates="mobile-demo" class="button-collapse"><i class="material-icons">menu</i></a>
<ul class="right hide-on-med-and-down">
<li><a href="#">Courses</a></li>
<% if(!user_signed_in?) %>
<li><%= link_to "Sign Up", new_user_registration_path %></li>
<li><%= link_to "Login", new_user_session_path %></li>
<% else %>
<!-- Dropdown Trigger -->
<li><a class="dropdown-button" href="#!" data-activates="dropdown1"><%= current_user.email %> <i class="mdi-navigation-arrow-drop-down right"></i></a></li>
<% end %>
</ul>
</div>
</div>
</nav>
</ul>
<ul class="side-nav" id="mobile-demo">
<li><a href="#">Courses</a></li>
<li><%= link_to "Sign Up", new_user_registration_path %></li>
<li><%= link_to "Login", new_user_session_path %></li>
<!-- Dropdown Trigger -->
<li><a class="dropdown-button" href="#!" data-activates="dropdown2"><%= current_user.email %> <i class="mdi-navigation-arrow-drop-down right"></i></a></li>
<% end %>
</ul>
</div>
</div>
</nav>
</header>
<p class="notice"><%= notice %></p>
<p class="alert"><%= alert %></p>
<main>
<div class="container">
<%= yield %>
</div>
</main>
<footer class="page-footer brown lighten-4">
<div class="container">
<div class="row">
<div class="col l6 s12">
<h5 class="white-text">Code4Pro</h5>
<p class="grey-text text-lighten-4">Mussum ipsum cacilds, vidis litro abertis. Consetis adipiscings elitis. Pra lá , depois divoltis porris, paradis. Paisis, filhis, espiritis santis. Mé faiz elementum girarzis, nisi eros vermeio, in elementis mé pra quem é amistosis quis leo. Manduma pindureta quium dia nois paga. Sapien in monti palavris qui num significa nadis i pareci latim. Interessantiss quisso pudia ce receita de bolis, mais bolis eu num gostis.</p>
</div>
<div class="col l4 offset-l2 s12">
<h5 class="white-text">Social</h5>
<ul>
<li><a class="grey-text text-lighten-3" href="#!">Twitter</a></li>
<li><a class="grey-text text-lighten-3" href="#!">Facebook</a></li>
<li><a class="grey-text text-lighten-3" href="#!">Google Plus</a></li>
</ul>
</div>
</div>
</div>
<div class="footer-copyright">
<div class="container">
© 2015 Copyright Haruo
<%= link_to "About us", pages_about_path, :class => "" %>
</div>
</div>
</footer>
</body>
<script>
$(".button-collapse").sideNav();
$(".dropdown-button").dropdown();
</script>
</html>
谢谢！