mono apache2 error "File exists: Failed to create shared memory segment for backend 'XXGLOBAL'"

["Star Liu" <minxinjianxin@gmail.com>]

I installed mono asp.net server by apt-get install mono-xsp2
libapache2-mod-mono asp.net2-examples
after that when i restart apache2, it failed
# /etc/init.d/apache2 restart
Restarting web server: apache2[Sun Jul 13 16:29:23 2008] [crit]
(17)File exists: Failed to create shared memory segment for backend
'XXGLOBAL'
[Sun Jul 13 16:29:23 2008] [crit] (17)File exists: Failed to create
shared memory segment for backend 'XXGLOBAL'

anyone got this error before? how could i fix it?

thanks
-- 
Regards!
Star
Shanghai, China