<!DOCTYPE html>
<html>

  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <link rel="stylesheet" href="<%= File.join Hammer::ENV.stylesheet_path, 'default.css' %>"> </link>  
    <title> Preview </title>
  </head>
  
  <body>
    <div id="content">
      <%= yield %>
    </div>
  </body>

</html>


<!DOCTYPE html>
<html>

  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <link rel="stylesheet" href="<%= File.join(Hammer::ENV.stylesheet_path, 'default.css') %>"> </link>  
    <title> Preview </title>
  </head>
  
  <body>
    <div id="content">
      <%= yield %>
    </div>
  </body>

</html>


Change default template slightly (add parenthesis for File.join)
Change default template slightly (add parenthesis for File.join)
