Rails：语法错误，意外的keyword_ensure，期望$ end

我正在创建一个非常基本的Rails应用程序（学习教程），但无法理解为什么会出现此错误。我曾尝试过疑难解答，但无济于事。

I'm creating a very basic rails app (learning tutorial) and can't understand why I'm getting this error. I've tried troubleshooting but to no avail.

我的代码：

<ul class = "nav pull-right">
  <% if user_signed_in? %>
    <li><%= link_to current_user.full_name, edit_user_registration_path %></li>
    <li><%= link_to "Log Out", destroy_user_session_path, method: :delete %></li>
  <% end %> 

  <% else %>

    <li><%= link_to "Log In", new_user_session_path %></li>
    <li><%= link_to "Sign Up", new_user_registration_path %></li>
  <%end%>

</ul>

一切正常，直到我添加了Else语句，但不知道我的错误是什么-我'肯定这是一个非常小的语法修复程序，但是您的帮助将不胜感激。

Everything was working fine, until I added the Else statement, but no idea what my error is - I'm sure it's a very minor syntax fix, but your help would be much appreciated.