Spring ( https://github.com/jonleighton/spring ) を開始しようとすると、次のエラーが表示されます。Ubuntu 12.04 LTS 12.04 を搭載した Vagrant ボックスで実行しています。
vagrant@rails-starter-box:/vagrant/ticketee$ spring start
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/spring-0.0.8/lib/spring/server.rb:85:in `unlink': Text file busy - /vagrant/ticketee/tmp/spring/spring.pid (Errno::ETXTBSY)
from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/spring-0.0.8/lib/spring/server.rb:85:in `unlink'
from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/spring-0.0.8/lib/spring/server.rb:85:in `block (2 levels) in set_exit_hook'
from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/spring-0.0.8/lib/spring/server.rb:84:in `each'
from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/spring-0.0.8/lib/spring/server.rb:84:in `block in set_exit_hook'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/spring-0.0.8/lib/spring/server.rb:34:in `initialize': Operation not permitted - /vagrant/ticketee/tmp/spring/spring (Errno::EPERM)
from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/spring-0.0.8/lib/spring/server.rb:34:in `open'
from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/spring-0.0.8/lib/spring/server.rb:34:in `boot'
from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/spring-0.0.8/lib/spring/server.rb:15:in `boot'
from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/spring-0.0.8/lib/spring/client/start.rb:13:in `call'
from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/spring-0.0.8/lib/spring/client/command.rb:7:in `call'
from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/spring-0.0.8/lib/spring/client.rb:23:in `run'
from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/spring-0.0.8/bin/spring:4:in `'
from /usr/local/rvm/gems/ruby-1.9.3-p194/bin/spring:19:in `load'
from /usr/local/rvm/gems/ruby-1.9.3-p194/bin/spring:19:in `'
from /usr/local/rvm/gems/ruby-1.9.3-p194/bin/ruby_noexec_wrapper:14:in `eval'
from /usr/local/rvm/gems/ruby-1.9.3-p194/bin/ruby_noexec_wrapper:14:in `'