vagrant box add error

c:/vagrant/vagrant/embedded/gems/gems/vagrant-1.1.2/lib/vagrant/util/subprocess.rb:81:in `rescue in
execute': The system cannot find the file specified. (2) (Vagrant::Util::Subprocess::LaunchError)
        from c:/vagrant/vagrant/embedded/gems/gems/vagrant-1.1.2/lib/vagrant/util/subprocess.rb:74:i
n `execute'
        from c:/vagrant/vagrant/embedded/gems/gems/vagrant-1.1.2/lib/vagrant/util/subprocess.rb:20:i
n `execute'
        from c:/vagrant/vagrant/embedded/gems/gems/vagrant-1.1.2/lib/vagrant/box_collection.rb:104:i
n `block in add'
        from c:/vagrant/vagrant/embedded/lib/ruby/1.9.1/tmpdir.rb:83:in `mktmpdir'
        from c:/vagrant/vagrant/embedded/gems/gems/vagrant-1.1.2/lib/vagrant/box_collection.rb:99:in
 `add'
        from c:/vagrant/vagrant/embedded/gems/gems/vagrant-1.1.2/lib/vagrant/action/builtin/box_add.
rb:35:in `call'
        from c:/vagrant/vagrant/embedded/gems/gems/vagrant-1.1.2/lib/vagrant/action/warden.rb:34:in
`call'
        from c:/vagrant/vagrant/embedded/gems/gems/vagrant-1.1.2/lib/vagrant/action/builder.rb:109:i
n `call'
        from c:/vagrant/vagrant/embedded/gems/gems/vagrant-1.1.2/lib/vagrant/action/runner.rb:61:in
`block in run'
        from c:/vagrant/vagrant/embedded/gems/gems/vagrant-1.1.2/lib/vagrant/util/busy.rb:19:in `bus
y'
        from c:/vagrant/vagrant/embedded/gems/gems/vagrant-1.1.2/lib/vagrant/action/runner.rb:61:in
`run'
        from c:/vagrant/vagrant/embedded/gems/gems/vagrant-1.1.2/plugins/commands/box/command/add.rb
:33:in `execute'
        from c:/vagrant/vagrant/embedded/gems/gems/vagrant-1.1.2/plugins/commands/box/command/root.r
b:47:in `execute'
        from c:/vagrant/vagrant/embedded/gems/gems/vagrant-1.1.2/lib/vagrant/cli.rb:46:in `execute'
        from c:/vagrant/vagrant/embedded/gems/gems/vagrant-1.1.2/lib/vagrant/environment.rb:406:in `
cli'
        from c:/vagrant/vagrant/embedded/gems/gems/vagrant-1.1.2/bin/vagrant:60:in `<top (required)>
'
        from c:/vagrant/vagrant/bin/../embedded/gems/bin/vagrant:23:in `load'
        from c:/vagrant/vagrant/bin/../embedded/gems/bin/vagrant:23:in `<main>'