Our application runs two Rails servers at different ports that talk to each other. Using Rails 3.2.8, I could open a terminal, cd to the project, run rail
cd
rail
Both commands are checking the default PID file location (tmp/pids/server.pid), so you're seeing this error. Try running multiple servers like so:
tmp/pids/server.pid
Server 1: bundle exec rails s
bundle exec rails s
Server 2: bundle exec rails s -p 3001 -P tmp/pids/server2.pid
bundle exec rails s -p 3001 -P tmp/pids/server2.pid