Unable to start the Thin cluster

[coding-bunny]

I'm currently unable to to start up my Thin cluster on an Ubuntu server.
The gem is not installed, but beeing managed through bundler.

I had a cluster running before, but Capistrano does not seem to be able to start it up anymore, nor can I fire it up manually either.
I had a yml config file that I used in the the following command:

bundle exec thin restart -C thin.yml

But this either starts only up a single instance of Thin, or i receive error messages about duplicate PID entries in the pid file or not pids found at all in the config file.
This is the content of the yml file:

---

pid: tmp/pids/thin.pid
address: 0.0.0.0
timeout: 30
wait: 30
port: 4000
log: log/thin.log
max_conns: 1024
require: []

environment: production
max_persistent_conns: 512
server: 4
daemonize: true
chdir: /var/www/apps/current

[coding-bunny]

Found the problem.....needs to be servers instead of server in config........