MySQL address map cannot be used??

When I click on
RECHECK AND REFRESH CONFIGURATION
I get the following error message:
"The address mapping source mysql:/etc/postfix/mysql-virtual-alias-maps.cf cannot be used : The MySQL configuration parameter table was not found. Webmin needs this to figure out which table and fields to query."

the …alias_maps works for Postfix just fine.
Why can’t the .cf be used in Webmin?

I have search in vain to find a "MySQL configuration parameter table" reference anywhere. What is this?
How is this problem fixed?

Althou my postfix-postfixadmin-mysql-dovecot-sasl system is running smooth, i get this error:

A problem was found with your Postfix virtual maps : The map source mysql:/etc/postfix/mysql/virtual_alias_maps.cf cannot be used : The MySQL configuration parameter table was not found. Webmin needs this to figure out which table and fields to query.

The file contains the query needed and permissions to the file are as follows:

-rw-r----- 1 root postfix 136 dec 18 20:37 virtual_alias_maps.cf

Any solution?