open_basedir restriction again with webmail after upgrade
Hi, We just did an upgrade from 2.x to 5.0.3. Everything seems working fine but the webmail. While trying to access it gives error:

Warning: open_basedir restriction in effect. File is in wrong directory in /home/psa_home/vhosts/webmail/horde/lib/Registry.php on line 4

I know how to fix with vhost.conf but in this case, i don't know where to put vhost.conf. Any help would be appreciated.