To repair this issue, you need to enabled piped logging.
1. Log in to the server shell.
2. Issue the command:
mysql -uadmin -p`cat /etc/psa/.psa.shadow` psa -e "replace into misc (param,val) values ('apache_pipelog', 'true');"
3. Rebuild Apache configuration:
<a href="http://kb.parallels.com/en/952">$PRODUCT_ROOT_D</a>/admin/sbin/websrvmng -v -a