Traceback (most recent call last):
  File "/usr/bin/papercut", line 958, in <module>
    write_pid(os.getpid())
  File "/usr/bin/papercut", line 885, in write_pid
    fp = open(settings.pid_file, 'w')
IOError: [Errno 2] No such file or directory: '/var/run/papercut/papercut.pid'