When I am starting rails server using rails s command it is showing A server is already running. Check C:/Sites/folder/Pids/Server.pids
rails s
A server is already running. Check C:/Sites/folder/Pids/Server.pids
Whe
Remove the file: C:/Sites/folder/Pids/Server.pids
Explanation In UNIX land at least we usually track the process id (pid) in a file like server.pid. I think this is doing the same thing here. That file was probably left over from a crash.