I tried posting last week, but never got a reply. Can someone point out to me why i'm getting these errors on a RedHat linux box (v5.1)?

I'm getting these errors in /var/log/cron from mailman. Can anyone tell me what this is all about, and how to fix it? I know that the cron daemon is being asked to run this via mailman, but is this just a permissions issue, or possibly a bad install? I'll also attach an emailed error that I used to get, but no longer get anymore for some reason...

mailman (04/15-11:12:00-5473) CMD (/usr/bin/python /home/mailman/cron/run_queue) mailman (04/15-11:42:00-5481) CMD (/usr/bin/python /home/mailman/cron/run_queue) mailman (04/15-12:00:00-5485) CMD (/usr/bin/python /home/mailman/cron/senddigests) root (04/15-12:01:00-5487) CMD (run-parts /etc/cron.hourly) mailman (04/15-12:12:00-5492) CMD (/usr/bin/python /home/mailman/cron/run_queue) mailman (04/15-12:42:00-5498) CMD (/usr/bin/python /home/mailman/cron/run_queue) root (04/15-13:01:00-5501) CMD (run-parts /etc/cron.hourly) mailman (04/15-13:12:00-5506) CMD (/usr/bin/python /home/mailman/cron/run_queue) mailman (04/15-13:42:00-5513) CMD (/usr/bin/python /home/mailman/cron/run_queue) root (04/15-14:01:00-5515) CMD (run-parts /etc/cron.hourly) mailman (04/15-14:12:00-5519) CMD (/usr/bin/python /home/mailman/cron/run_queue) mailman (04/15-14:42:00-5529) CMD (/usr/bin/python /home/mailman/cron/run_queue) root (04/15-15:01:00-5532) CMD (run-parts /etc/cron.hourly) mailman (04/15-15:12:00-5538) CMD (/usr/bin/python /home/mailman/cron/run_queue) mailman (04/15-15:42:00-5551) CMD (/usr/bin/python /home/mailman/cron/run_queue) root (04/15-16:01:00-5556) CMD (run-parts /etc/cron.hourly) mailman (04/15-16:12:00-5560) CMD (/usr/bin/python /home/mailman/cron/run_queue) mailman (04/15-16:42:00-5570) CMD (/usr/bin/python /home/mailman/cron/run_queue) mailman (04/15-17:00:00-5576) CMD (/usr/bin/python /home/mailman/cron/checkdbs) root (04/15-17:01:00-5578) CMD (run-parts /etc/cron.hourly) mailman (04/15-17:12:00-5599) CMD (/usr/bin/python /home/mailman/cron/run_queue) mailman (04/15-17:42:00-5606) CMD (/usr/bin/python /home/mailman/cron/run_queue)

This is a copy of one of the emails I used to get:

Traceback (innermost last): File "/home/mailman/cron/run_queue", line 31, in ? OutgoingQueue.processQueue() File "/home/mailman/Mailman/OutgoingQueue.py", line 86, in processQueue lock_file.lock() File "/home/mailman/Mailman/flock.py", line 119, in lock os.link(self.lockfile, self.tmpfname) os.error: (13, 'Permission denied')

Thanx in advance, Adam