When stretch attributes to multiline in Haml, I got an unbalanced brackets error

The following code gives me unbalanced bracket error at line 4

%ul
  - @sentences.each do |sentence|
    %li
      %a{id:"s-#{sentence.id}",
      href:"/sentence/#{sentence.id}",
      'data-type' => 'text',
      'data-url' => "/sentence/#{sentence.id}",
      'data-toggle' => 'manual'
      }= sentence.content
      %a{href:'#'}
        %i.icon-pencil



Haml::SyntaxError at /user/1/sentence
Unbalanced brackets.
file: sentences.haml location: nil line: 4

any idea?