Even after running chmod -R a+w on adserver/var, still getting this problem.
Looks like it is a problem with PHP
File permission errors have been detected, and must be fixed before you can continue.
To fix the errors on a Linux system, try typing in the following command(s):
chmod -R a+w /home/a2z/public_html/adserver/var
For more help, please see the Revive Adserver documentation.