Issue with quota? Needs suggestion.

I am using cPanel VPS 11.26.8



I am facing strange issue with disk quota, something to do with /dev/simfs
.. While creating any domain from cpanel, the home directory shows empty
and we cannot login. It started after we upgrade from 11.25.

The error message we get as following - " a fatal error
or timeout occurred while processing this directive"

I checked /usr/local/cpanel/logs/error_log, it looks like something to do with the VPS instance. Will you please confirm.

Error i got in /usr/local/cpanel/logs/error_log

*tar: Error exit delayed from previous errors*
*edquota: Cannot set quota for user 836 from kernel on /dev/simfs: No such
process*
*edquota: Can't write quota for 836 on /dev/simfs: No such process*
*[2010-09-10 12:44:09 +0400] warn [whostmgr5] Failed to set ownership on
user directory in cpanel userdata at /usr/local/cpanel/Cpanel/Config/
userdata.pm line 688*


Thanks for your help.

Thanks.