Hi,
Please update FOP2 to the latest version (released two days ago), it should fix the issue.
If you want to do it manually, edit the file /var/www/html/fop2/admin/system.php and look for the string
"amportal.conf"
and replace it with
"xxxxamportal.conf"
That should fix the issue also (quick and dirty). It is best to update to latest with this command:
wget -O - http://download.fop2.com/upgrade_fop2.sh | bash
Best regards,