rails error

Started POST "/api/v1/users" for 127.0.0.1 at 2016-01-29 23:59:33 -0800
Error occurred while parsing request parameters.
Contents:

'{user:{name:admin,password:password}}'

ActionDispatch::ParamsParser::ParseError (795: unexpected token at ''{user:{name
:admin,password:password}}''):
  actionpack (4.1.8) lib/action_dispatch/middleware/params_parser.rb:53:in `resc
ue in parse_formatted_parameters'
  actionpack (4.1.8) lib/action_dispatch/middleware/params_parser.rb:32:in `pars
e_formatted_parameters'
  actionpack (4.1.8) lib/action_dispatch/middleware/params_parser.rb:23:in `call
'
  actionpack (4.1.8) lib/action_dispatch/middleware/flash.rb:254:in `call'
  rack (1.5.5) lib/rack/session/abstract/id.rb:225:in `context'
  rack (1.5.5) lib/rack/session/abstract/id.rb:220:in `call'
  actionpack (4.1.8) lib/action_dispatch/middleware/cookies.rb:560:in `call'
  activerecord (4.1.8) lib/active_record/query_cache.rb:36:in `call'
  activerecord (4.1.8) lib/active_record/connection_adapters/abstract/connection
_pool.rb:621:in `call'
  activerecord (4.1.8) lib/active_record/migration.rb:380:in `call'
  actionpack (4.1.8) lib/action_dispatch/middleware/callbacks.rb:29:in `block in
 call'
  activesupport (4.1.8) lib/active_support/callbacks.rb:82:in `run_callbacks'
  actionpack (4.1.8) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
  actionpack (4.1.8) lib/action_dispatch/middleware/reloader.rb:73:in `call'
  actionpack (4.1.8) lib/action_dispatch/middleware/remote_ip.rb:76:in `call'
  actionpack (4.1.8) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `c
all'
  actionpack (4.1.8) lib/action_dispatch/middleware/show_exceptions.rb:30:in `ca
ll'
  railties (4.1.8) lib/rails/rack/logger.rb:38:in `call_app'
  railties (4.1.8) lib/rails/rack/logger.rb:20:in `block in call'
  activesupport (4.1.8) lib/active_support/tagged_logging.rb:68:in `block in tag
ged'
  activesupport (4.1.8) lib/active_support/tagged_logging.rb:26:in `tagged'
  activesupport (4.1.8) lib/active_support/tagged_logging.rb:68:in `tagged'
  railties (4.1.8) lib/rails/rack/logger.rb:20:in `call'
  actionpack (4.1.8) lib/action_dispatch/middleware/request_id.rb:21:in `call'
  rack (1.5.5) lib/rack/methodoverride.rb:21:in `call'
  rack (1.5.5) lib/rack/runtime.rb:17:in `call'
  activesupport (4.1.8) lib/active_support/cache/strategy/local_cache_middleware
.rb:26:in `call'
  rack (1.5.5) lib/rack/lock.rb:17:in `call'
  actionpack (4.1.8) lib/action_dispatch/middleware/static.rb:84:in `call'
  rack (1.5.5) lib/rack/sendfile.rb:112:in `call'
  railties (4.1.8) lib/rails/engine.rb:514:in `call'
  railties (4.1.8) lib/rails/application.rb:144:in `call'
  rack (1.5.5) lib/rack/lock.rb:17:in `call'
  rack (1.5.5) lib/rack/content_length.rb:14:in `call'
  rack (1.5.5) lib/rack/handler/webrick.rb:60:in `service'
  C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/webrick/httpserver.rb:138:in `servi
ce'
  C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/webrick/httpserver.rb:94:in `run'
  C:/RailsInstaller/Ruby2.1.0/lib/ruby/2.1.0/webrick/server.rb:295:in `block in
start_thread'