Showing /home/davidnghk/App6/fc4s/code/app/views/devise/registrations/edit.html.erb where line #91 raised:

undefined method `dark?' for #<RQRCode::QRCode:0x00007f8f111d7200>


                  <tr>
                    <% qr.modules.each_index do |y| %>
                        <% if qr.dark?(x,y) %>
                            <td class="black"/>
                        <% else %>
                            <td class="white"/>