Vagrant permissions error

error

vagrant@lucid32:/vagrant$ rails new sample
      create
/home/vagrant/.rbenv/versions/1.9.3-p125/lib/ruby/1.9.1/fileutils.rb:247:in `mkdir': Permission denied - /vagrant/sample (Errno::EACCES)
        from /home/vagrant/.rbenv/versions/1.9.3-p125/lib/ruby/1.9.1/fileutils.rb:247:in `fu_mkdir'
        from /home/vagrant/.rbenv/versions/1.9.3-p125/lib/ruby/1.9.1/fileutils.rb:221:in `block (2 levels) in mkdir_p'
        from /home/vagrant/.rbenv/versions/1.9.3-p125/lib/ruby/1.9.1/fileutils.rb:219:in `reverse_each'
        from /home/vagrant/.rbenv/versions/1.9.3-p125/lib/ruby/1.9.1/fileutils.rb:219:in `block in mkdir_p'
        from /home/vagrant/.rbenv/versions/1.9.3-p125/lib/ruby/1.9.1/fileutils.rb:205:in `each'
        from /home/vagrant/.rbenv/versions/1.9.3-p125/lib/ruby/1.9.1/fileutils.rb:205:in `mkdir_p'
        from /home/vagrant/.rbenv/versions/1.9.3-p125/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/actions/empty_directory.rb:51:in `block in invoke!'
        from /home/vagrant/.rbenv/versions/1.9.3-p125/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/actions/empty_directory.rb:114:in `call'
        from /home/vagrant/.rbenv/versions/1.9.3-p125/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/actions/empty_directory.rb:114:in `invoke_with_conflict_check'
        from /home/vagrant/.rbenv/versions/1.9.3-p125/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/actions/empty_directory.rb:50:in `invoke!'
        from /home/vagrant/.rbenv/versions/1.9.3-p125/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/actions.rb:95:in `action'
        from /home/vagrant/.rbenv/versions/1.9.3-p125/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/actions/empty_directory.rb:15:in `empty_directory'
        from /home/vagrant/.rbenv/versions/1.9.3-p125/lib/ruby/gems/1.9.1/gems/railties-3.2.1/lib/rails/generators/app_base.rb:103:in `create_root'
        from (eval):1:in `create_root'
        from /home/vagrant/.rbenv/versions/1.9.3-p125/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/task.rb:22:in `run'
        from /home/vagrant/.rbenv/versions/1.9.3-p125/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/invocation.rb:118:in `invoke_task'
        from /home/vagrant/.rbenv/versions/1.9.3-p125/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/invocation.rb:124:in `block in invoke_all'
        from /home/vagrant/.rbenv/versions/1.9.3-p125/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/invocation.rb:124:in `each'
        from /home/vagrant/.rbenv/versions/1.9.3-p125/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/invocation.rb:124:in `map'
        from /home/vagrant/.rbenv/versions/1.9.3-p125/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/invocation.rb:124:in `invoke_all'
        from /home/vagrant/.rbenv/versions/1.9.3-p125/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/group.rb:226:in `dispatch'
        from /home/vagrant/.rbenv/versions/1.9.3-p125/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/base.rb:389:in `start'
        from /home/vagrant/.rbenv/versions/1.9.3-p125/lib/ruby/gems/1.9.1/gems/railties-3.2.1/lib/rails/commands/application.rb:38:in `<top (required)>'
        from /home/vagrant/.rbenv/versions/1.9.3-p125/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
        from /home/vagrant/.rbenv/versions/1.9.3-p125/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
        from /home/vagrant/.rbenv/versions/1.9.3-p125/lib/ruby/gems/1.9.1/gems/railties-3.2.1/lib/rails/cli.rb:15:in `<top (required)>'
        from /home/vagrant/.rbenv/versions/1.9.3-p125/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
        from /home/vagrant/.rbenv/versions/1.9.3-p125/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
        from /home/vagrant/.rbenv/versions/1.9.3-p125/lib/ruby/gems/1.9.1/gems/railties-3.2.1/bin/rails:7:in `<top (required)>'
        from /home/vagrant/.rbenv/versions/1.9.3-p125/bin/rails:19:in `load'
        from /home/vagrant/.rbenv/versions/1.9.3-p125/bin/rails:19:in `<main>'
vagrant@lucid32:/vagrant$