vagrant ssh

vagrant ssh stacktrace

$ vagrant ssh
/Library/Ruby/Gems/1.8/gems/virtualbox-0.7.3.dev/lib/virtualbox/abstract_model/version_matcher.rb:28:in `split_version': private method `split' called for nil:NilClass (NoMethodError)
        from /Library/Ruby/Gems/1.8/gems/virtualbox-0.7.3.dev/lib/virtualbox/abstract_model/version_matcher.rb:18:in `version_match?'
        from /Library/Ruby/Gems/1.8/gems/virtualbox-0.7.3.dev/lib/virtualbox/abstract_model/version_matcher.rb:7:in `assert_version_match'
        from /Library/Ruby/Gems/1.8/gems/virtualbox-0.7.3.dev/lib/virtualbox/abstract_model/relatable.rb:189:in `read_relationship'
        from /Library/Ruby/Gems/1.8/gems/virtualbox-0.7.3.dev/lib/virtualbox/abstract_model/relatable.rb:146:in `nat_driver'
        from /Library/Ruby/Gems/1.8/gems/vagrant-0.4.2.dev/lib/vagrant/ssh.rb:137:in `port'
        from /Library/Ruby/Gems/1.8/gems/vagrant-0.4.2.dev/lib/vagrant/ssh.rb:136:in `each'
        from /Library/Ruby/Gems/1.8/gems/vagrant-0.4.2.dev/lib/vagrant/ssh.rb:136:in `port'
        from /Library/Ruby/Gems/1.8/gems/vagrant-0.4.2.dev/lib/vagrant/ssh.rb:38:in `connect'
        from /Library/Ruby/Gems/1.8/gems/vagrant-0.4.2.dev/lib/vagrant/commands/ssh.rb:62:in `ssh_connect'
        from /Library/Ruby/Gems/1.8/gems/vagrant-0.4.2.dev/lib/vagrant/commands/ssh.rb:20:in `execute'
        from /Library/Ruby/Gems/1.8/gems/vagrant-0.4.2.dev/lib/vagrant/commands/base.rb:41:in `dispatch'
        from /Library/Ruby/Gems/1.8/gems/vagrant-0.4.2.dev/lib/vagrant/commands/base.rb:50:in `dispatch'
        from /Library/Ruby/Gems/1.8/gems/vagrant-0.4.2.dev/lib/vagrant/command.rb:24:in `subcommand'
        from /Library/Ruby/Gems/1.8/gems/vagrant-0.4.2.dev/lib/vagrant/command.rb:13:in `execute'
        from /Library/Ruby/Gems/1.8/gems/vagrant-0.4.2.dev/bin/vagrant:7
        from /usr/bin/vagrant:19:in `load'
        from /usr/bin/vagrant:19