sudhir@sudhir-desktop:~$ service apache2 restart
* Restarting web server apache2 /usr/sbin/apache2ctl: 87: ulimit: error setting limit (Operation not permitted)
[Thu Oct 04 22:16:42 2012] [warn] The Alias directive in /etc/apache2/sites-enabled/001-zoneminder at line 1 will probably never match because it overlaps an earlier Alias.
/usr/sbin/apache2ctl: 87: ulimit: error setting limit (Operation not permitted)
[Thu Oct 04 22:16:42 2012] [warn] The Alias directive in /etc/apache2/sites-enabled/001-zoneminder at line 1 will probably never match because it overlaps an earlier Alias.
(13)Permission denied: make_sock: could not bind to address 0.0.0.0:80
no listening sockets available, shutting down
Unable to open logs
Action 'start' failed.
The Apache error log may have more information.
pls explain this