1. Take the backup of /var/cpanel/userdata
# cp /var/cpanel/userdata /var/cpanel/userdata.bak
2. Run /usr/local/cpanel/bin/userdata_update –reset so that /var/cpanel/userdata can be regenerated.
# /usr/local/cpanel/bin/userdata_update –reset
3. After doing this rebuilt the userdatacache by running
# /usr/local/cpanel//scripts/updateuserdatacache --force
5. Rebuild Apache conf
# /usr/local/cpanel/bin/build_apache_conf
6. Restart Apache.
# /etc/init.d/httpd stop
# /etc/init.d/httpd start