SyntaxError in Logins#lost_password

Showing app/views/logins/lost_password.html.erb where line #8 raised: 

compile error
/Users/tamc2/Documents/NMK/feb-28-upgrade/app/views/logins/lost_password.html.erb:8: syntax error, unexpected ')'
@output_buffer.concat(( @email ? "Sorry, email address not found.").to_s); @output_buffer.concat "\n"
                                                                   ^

Extracted source (around line #8): 

5: <div class="green_block"></div>
6: 
7: <%form_tag reset_password_login_path do%>
8: <%= @email ? "Sorry, email address not found."%>
9: <label for="email">EMAIL</label><br /> 
10: <%=text_field_tag 'email', @email%><br /><br />
11: <p><%=submit_tag 'Send a new password', :class=>'white_submit'%></p>

Trace of template inclusion: app/views/logins/lost_password.html.erb

RAILS_ROOT: /Users/tamc2/Documents/NMK/feb-28-upgrade

Application Trace | Framework Trace | Full Trace 
/Users/tamc2/Documents/NMK/feb-28-upgrade/app/views/logins/lost_password.html.erb:17:in `compile!'
/Library/Ruby/Gems/1.8/gems/haml-2.0.6/lib/haml/helpers/action_view_mods.rb:14:in `render'
/Library/Ruby/Gems/1.8/gems/haml-2.0.6/lib/haml/helpers/action_view_mods.rb:14:in `render'
/Library/Ruby/Gems/1.8/gems/haml-2.0.6/lib/sass/plugin/rails.rb:19:in `process'

Request

Parameters: 

None

Show session dump

Response

Headers: 

{"Content-Type"=>"",
 "Cache-Control"=>"no-cache"}