No virtual domains file (virtual_alias_maps) was found in your Postfix configuration!

I recently updated Virtualmin GPL to the newest version available... last week if I recall correctly. During the upgrade it said it failed, but did not provide any information as to why... but when attempting to re-do the upgrade it would say no new packages were available. So I decided to restart webmin/virtualmin, and when doing so the version showed the newest number (3.75) and everything seemed to work fine.

Well just tonight I tried to change the password on one of my virtual servers, and it shows this when clicking on "Save Virtual Server":

Failed to modify server : No virtual domains file (virtual_alias_maps) was found in your Postfix configuration!

Mail works fine for this virtual server, and main.cf has:

virtual_alias_maps = hash:/etc/postfix/virtual

I am not quite sure why it is showing this error or what to do about it. Here is postconf -n:

[root@server1 postfix]# postconf -n
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
bounce_queue_lifetime = 2d
bounce_template_file = /etc/postfix/bounce.cf
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/libexec/postfix
debug_peer_level = 2
delay_warning_time = 6h
header_checks = regexp:/etc/postfix/header_checks
home_mailbox = Maildir/
html_directory = no
mail_version = EGGYCrew Mail Server
mailbox_command = /usr/bin/procmail-wrapper -o -a $DOMAIN -d $LOGNAME
mailbox_size_limit = 0
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
maximal_queue_lifetime = 2d
message_size_limit = 52428800
mydestination = $myhostname, localhost.$mydomain, localhost, localhost.localdomain
newaliases_path = /usr/bin/newaliases.postfix
queue_run_delay = 900s
readme_directory = /usr/share/doc/postfix-2.3.3/README_FILES
sample_directory = /usr/share/doc/postfix-2.3.3/samples
sender_bcc_maps = hash:/etc/postfix/bcc
sendmail_path = /usr/sbin/sendmail.postfix
setgid_group = postdrop
smtpd_recipient_restrictions = permit_mynetworks permit_sasl_authenticated reject_unauth_destination check_client_access hash:/etc/postfix/rbl_override reject_rbl_client zen.spamhaus.org
smtpd_sasl_auth_enable = yes
smtpd_sasl_authenticated_header = yes
smtpd_tls_cert_file = /etc/postfix/server.crt
smtpd_tls_key_file = /etc/postfix/server.key
smtpd_tls_loglevel = 1
smtpd_tls_received_header = yes
smtpd_tls_security_level = may
smtpd_tls_session_cache_timeout = 3600s
tls_random_source = dev:/dev/urandom
unknown_local_recipient_reject_code = 550
virtual_alias_maps = hash:/etc/postfix/virtual

The only thing in this configuration that is non-standard is my reject_rbl_client, and check_client_access hash:/etc/postfix/rbl_override. The check_client_access_hash contains IP addresses that I do not want checked against any RBL's. This never caused any problems in the previous version of Virtualmin I was running prior to this upgrade, so that would not lead me to believe it should cause this problem now. However just to make sure I pulled those two modifications out, restarted postfix, and then tried changing the VS's password and it still showed the same error.

Any help in pointing me in the right direction as to what the cause of this is would be a great help!

Thanks!