Haml::SyntaxError in Articles#homepage

Showing app/views/layouts/application.html.haml where line #2 raised: 

A tab character was used for indentation. Haml must be indented using two spaces.
Are you sure you have soft tabs enabled in your editor?

Extracted source (around line #2): 

1: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
2: 	"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
3: 
4: <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
5: <head>

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

Application Trace | Framework Trace | Full Trace 
/Users/tamc2/Documents/NMK/feb-28-upgrade/app/views/layouts/application.html.haml:2
/Library/Ruby/Gems/1.8/gems/haml-2.0.6/lib/haml/precompiler.rb:766:in `count_soft_tabs'
/Library/Ruby/Gems/1.8/gems/haml-2.0.6/lib/haml/precompiler.rb:124:in `precompile'
/Library/Ruby/Gems/1.8/gems/haml-2.0.6/lib/haml/precompiler.rb:122:in `each'
/Library/Ruby/Gems/1.8/gems/haml-2.0.6/lib/haml/precompiler.rb:122:in `each_with_index'
/Library/Ruby/Gems/1.8/gems/haml-2.0.6/lib/haml/precompiler.rb:122:in `precompile'
/Library/Ruby/Gems/1.8/gems/haml-2.0.6/lib/haml/engine.rb:100:in `initialize'
/Library/Ruby/Gems/1.8/gems/haml-2.0.6/lib/haml/template/plugin.rb:21:in `new'
/Library/Ruby/Gems/1.8/gems/haml-2.0.6/lib/haml/template/plugin.rb:21: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'
lib/crud_methods.rb:125:in `respond_appropriately'
/Users/tamc2/Documents/NMK/feb-28-upgrade/app/controllers/articles_controller.rb:11:in `homepage'
/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"=>"text/html",
 "Cache-Control"=>"no-cache"}