Vagrant login command is not working

Hi friends, I am not able to perform vagrant login from command line.

I am entering credentials Atlas username and password. But it is throwing following error:

/opt/vagrant/embedded/gems/gems/rest-client-2.0.0/lib/restclient/abstract_response.rb:223:in exception_with_response': 422 Unprocessable Entity (RestClient::UnprocessableEntity) from /opt/vagrant/embedded/gems/gems/rest-client-2.0.0/lib/restclient/abstract_response.rb:103:inreturn!' from /opt/vagrant/embedded/gems/gems/rest-client-2.0.0/lib/restclient/request.rb:860:in process_result' from /opt/vagrant/embedded/gems/gems/rest-client-2.0.0/lib/restclient/request.rb:776:inblock in transmit' from /opt/vagrant/embedded/lib/ruby/2.2.0/net/http.rb:853:in start' from /opt/vagrant/embedded/gems/gems/rest-client-2.0.0/lib/restclient/request.rb:766:intransmit' from /opt/vagrant/embedded/gems/gems/rest-client-2.0.0/lib/restclient/request.rb:215:in execute' from /opt/vagrant/embedded/gems/gems/rest-client-2.0.0/lib/restclient/request.rb:52:inexecute' from /opt/vagrant/embedded/gems/gems/vagrant-1.9.0/plugins/commands/login/client.rb:58:in block in login' from /opt/vagrant/embedded/gems/gems/vagrant-1.9.0/plugins/commands/login/client.rb:126:inwith_error_handling' from /opt/vagrant/embedded/gems/gems/vagrant-1.9.0/plugins/commands/login/client.rb:49:in login' from /opt/vagrant/embedded/gems/gems/vagrant-1.9.0/plugins/commands/login/command.rb:61:inexecute' from /opt/vagrant/embedded/gems/gems/vagrant-1.9.0/lib/vagrant/cli.rb:42:in execute' from /opt/vagrant/embedded/gems/gems/vagrant-1.9.0/lib/vagrant/environment.rb:308:incli' from /opt/vagrant/embedded/gems/gems/vagrant-1.9.0/bin/vagrant:123:in `<main>'

I am able to login in to atlas.hashicorp.com

Can any one suggest me the solution to fix this one.