Please help, what is nothing wrong in this configuration?
The status of your system is being checked to ensure that all enabled features are available, that the mail server is properly configured, and that quotas are active …
Your system has 3.86 GB of memory, which is at or above the Virtualmin recommended minimum of 256 MB. BIND DNS server is installed, and the system is configured to use it. Mail server Postfix is installed and configured. Your Postfix version does not support per-domain outgoing IP addresses. Apache is installed. The following PHP versions are available : 5.2.17 (/usr/bin/php-cgi) Webalizer is installed. Apache is configured to host SSL websites. MySQL does not appear to be installed and running on your system, or has not yet been set up properly in Webmin's MySQL Database module. If your system does not use MySQL, it should be disabled in Virtualmin's module configuration page.
… your system is not ready for use by Virtualmin.