chef-validator: 401 Unauthorized problem

server.log

merb : chef-server (api) : worker (port 4000) ~ Started request handling: Thu Aug 30 16:38:43 +0200 2012
merb : chef-server (api) : worker (port 4000) ~ Routed to: {"admin"=>false, "action"=>"create", "controller"=>"clients", "name"=>"builder"}
merb : chef-server (api) : worker (port 4000) ~ Params: {"admin"=>false, "action"=>"create", "controller"=>"clients", "name"=>"builder"}
merb : chef-server (api) : worker (port 4000) ~ Failed to authenticate. Ensure that your client key is valid. - (Merb::ControllerExceptions::Unauthorized)
/usr/lib/ruby/gems/1.8/gems/chef-server-api-10.12.0/app/controllers/application.rb:56:in `authenticate_every'
/usr/lib/ruby/gems/1.8/gems/merb-core-1.1.3/lib/merb-core/controller/abstract_controller.rb:352:in `send'
/usr/lib/ruby/gems/1.8/gems/merb-core-1.1.3/lib/merb-core/controller/abstract_controller.rb:352:in `_call_filters'
/usr/lib/ruby/gems/1.8/gems/merb-core-1.1.3/lib/merb-core/controller/abstract_controller.rb:344:in `each'
/usr/lib/ruby/gems/1.8/gems/merb-core-1.1.3/lib/merb-core/controller/abstract_controller.rb:344:in `_call_filters'
/usr/lib/ruby/gems/1.8/gems/merb-core-1.1.3/lib/merb-core/controller/abstract_controller.rb:286:in `_dispatch'
/usr/lib/ruby/gems/1.8/gems/merb-core-1.1.3/lib/merb-core/controller/abstract_controller.rb:284:in `catch'
/usr/lib/ruby/gems/1.8/gems/merb-core-1.1.3/lib/merb-core/controller/abstract_controller.rb:284:in `_dispatch'
/usr/lib/ruby/gems/1.8/gems/merb-core-1.1.3/lib/merb-core/controller/merb_controller.rb:285:in `_dispatch'
/usr/lib/ruby/gems/1.8/gems/merb-core-1.1.3/lib/merb-core/controller/merb_controller.rb:262:in `_call'
/usr/lib/ruby/gems/1.8/gems/merb-core-1.1.3/lib/merb-core/controller/merb_controller.rb:252:in `call'
/usr/lib/ruby/gems/1.8/gems/merb-core-1.1.3/lib/merb-core/dispatch/dispatcher.rb:91:in `dispatch_action'
/usr/lib/ruby/gems/1.8/gems/merb-core-1.1.3/lib/merb-core/dispatch/dispatcher.rb:69:in `handle'
/usr/lib/ruby/gems/1.8/gems/merb-core-1.1.3/lib/merb-core/dispatch/dispatcher.rb:29:in `handle'
/usr/lib/ruby/gems/1.8/gems/merb-core-1.1.3/lib/merb-core/rack/application.rb:17:in `call'
/usr/lib/ruby/gems/1.8/gems/merb-core-1.1.3/lib/merb-core/rack/middleware/static.rb:28:in `call'
/usr/lib/ruby/gems/1.8/gems/rack-1.4.1/lib/rack/content_length.rb:14:in `call'
/usr/lib/ruby/gems/1.8/gems/thin-1.3.1/lib/thin/connection.rb:80:in `pre_process'
/usr/lib/ruby/gems/1.8/gems/thin-1.3.1/lib/thin/connection.rb:78:in `catch'
/usr/lib/ruby/gems/1.8/gems/thin-1.3.1/lib/thin/connection.rb:78:in `pre_process'
/usr/lib/ruby/gems/1.8/gems/thin-1.3.1/lib/thin/connection.rb:53:in `process'
/usr/lib/ruby/gems/1.8/gems/thin-1.3.1/lib/thin/connection.rb:38:in `receive_data'
/usr/lib/ruby/gems/1.8/gems/eventmachine-1.0.0.beta.4/lib/eventmachine.rb:179:in `run_machine'
/usr/lib/ruby/gems/1.8/gems/eventmachine-1.0.0.beta.4/lib/eventmachine.rb:179:in `run'
/usr/lib/ruby/gems/1.8/gems/thin-1.3.1/lib/thin/backends/base.rb:61:in `start'
/usr/lib/ruby/gems/1.8/gems/thin-1.3.1/lib/thin/server.rb:159:in `start'
/usr/lib/ruby/gems/1.8/gems/merb-core-1.1.3/lib/merb-core/rack/adapter/thin.rb:30:in `start_server'
/usr/lib/ruby/gems/1.8/gems/merb-core-1.1.3/lib/merb-core/rack/adapter/abstract.rb:305:in `start_at_port'
/usr/lib/ruby/gems/1.8/gems/merb-core-1.1.3/lib/merb-core/rack/adapter/abstract.rb:138:in `start'
/usr/lib/ruby/gems/1.8/gems/merb-core-1.1.3/lib/merb-core/server.rb:174:in `bootup'
/usr/lib/ruby/gems/1.8/gems/merb-core-1.1.3/lib/merb-core/server.rb:159:in `daemonize'
/usr/lib/ruby/gems/1.8/gems/merb-core-1.1.3/lib/merb-core/server.rb:143:in `fork'
/usr/lib/ruby/gems/1.8/gems/merb-core-1.1.3/lib/merb-core/server.rb:143:in `daemonize'
/usr/lib/ruby/gems/1.8/gems/merb-core-1.1.3/lib/merb-core/server.rb:35:in `start'
/usr/lib/ruby/gems/1.8/gems/merb-core-1.1.3/lib/merb-core.rb:165:in `start'
/usr/lib/ruby/gems/1.8/gems/chef-server-api-10.12.0/bin/chef-server:84
/usr/bin/chef-server:19:in `load'
/usr/bin/chef-server:19
merb : chef-server (api) : worker (port 4000) ~ Params: {"admin"=>false, "action"=>"create", "controller"=>"clients", "name"=>"builder"}
merb : chef-server (api) : worker (port 4000) ~ {:before_filters_time=>6.2e-05, :dispatch_time=>0.046043, :action_time=>0.000984, :after_filters_time=>2.0e-05}
merb : chef-server (api) : worker (port 4000) ~