I can no longer use "knife client list" to list my clients on my chef server.
I used to be able to do this earlier today using knife and using server API.
Other commands such as "knife client show <name>" works fine.
[Tue, 08 May 2012 23:15:36 -0700] INFO: Authenticating client knife-sjang0-sde
merb : chef-server (api) : worker (port 4000) ~ Started request handling: Tue May 08 23:15:36 -0700 2012
merb : chef-server (api) : worker (port 4000) ~ Params: {"action"=>"index", "controller"=>"clients"}
merb : chef-server (api) : worker (port 4000) ~ Option name's value does not match regular _expression_ /^[\-[:alnum:]_\.]+$/ - (Chef::Exceptions::ValidationFailed)
/usr/lib/ruby/gems/1.8/gems/chef-0.10.4/lib/chef/mixin/params_validate.rb:196:in `_pv_regex'
/usr/lib/ruby/gems/1.8/gems/chef-0.10.4/lib/chef/mixin/params_validate.rb:69:in `send'
/usr/lib/ruby/gems/1.8/gems/chef-0.10.4/lib/chef/mixin/params_validate.rb:69:in `validate'
/usr/lib/ruby/gems/1.8/gems/chef-0.10.4/lib/chef/mixin/params_validate.rb:66:in `each'
/usr/lib/ruby/gems/1.8/gems/chef-0.10.4/lib/chef/mixin/params_validate.rb:66:in `validate'
/usr/lib/ruby/gems/1.8/gems/chef-0.10.4/lib/chef/mixin/params_validate.rb:56:in `each'
/usr/lib/ruby/gems/1.8/gems/chef-0.10.4/lib/chef/mixin/params_validate.rb:56:in `validate'
/usr/lib/ruby/gems/1.8/gems/chef-0.10.4/lib/chef/mixin/params_validate.rb:88:in `set_or_return'
/usr/lib/ruby/gems/1.8/gems/chef-0.10.4/lib/chef/api_client.rb:88:in `name'
/usr/lib/ruby/gems/1.8/gems/chef-0.10.4/lib/chef/api_client.rb:166:in `json_create'
/usr/lib/ruby/gems/1.8/gems/json-1.4.6/lib/json/common.rb:146:in `parse'
/usr/lib/ruby/gems/1.8/gems/json-1.4.6/lib/json/common.rb:146:in `parse'
/usr/lib/ruby/gems/1.8/gems/chef-0.10.4/lib/chef/json_compat.rb:40:in `from_json'
/usr/lib/ruby/gems/1.8/gems/chef-0.10.4/lib/chef/rest.rb:223:in `api_request'
/usr/lib/ruby/gems/1.8/gems/chef-0.10.4/lib/chef/rest.rb:288:in `retriable_rest_request'
/usr/lib/ruby/gems/1.8/gems/chef-0.10.4/lib/chef/rest.rb:218:in `api_request'
/usr/lib/ruby/gems/1.8/gems/chef-0.10.4/lib/chef/rest.rb:114:in `get_rest'
/usr/lib/ruby/gems/1.8/gems/chef-0.10.4/lib/chef/couchdb.rb:181:in `list'
/usr/lib/ruby/gems/1.8/gems/chef-0.10.4/lib/chef/api_client.rb:178:in `cdb_list'
/usr/lib/ruby/gems/1.8/gems/chef-server-api-0.10.4/app/controllers/clients.rb:32:in `index'
/usr/lib/ruby/gems/1.8/gems/merb-core-1.1.3/lib/merb-core/controller/abstract_controller.rb:321:in `send'
/usr/lib/ruby/gems/1.8/gems/merb-core-1.1.3/lib/merb-core/controller/abstract_controller.rb:321:in `_call_action'
/usr/lib/ruby/gems/1.8/gems/merb-core-1.1.3/lib/merb-core/controller/abstract_controller.rb:289: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-1.3.5/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-0.12.10/lib/eventmachine.rb:256:in `run_machine'
/usr/lib/ruby/gems/1.8/gems/eventmachine-0.12.10/lib/eventmachine.rb:256: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-0.10.4/bin/chef-server:84
/usr/bin/chef-server:19:in `load'
/usr/bin/chef-server:19
merb : chef-server (api) : worker (port 4000) ~ Params: {"action"=>"index", "controller"=>"clients"}
merb : chef-server (api) : worker (port 4000) ~ {:action_time=>0.000509, :after_filters_time=>1.7e-05, :before_filters_time=>6.3e-05, :dispatch_time=>0.066583}
merb : chef-server (api) : worker (port 4000) ~