Virtualmin--> Servers->Dkim Errors on Ubuntu 18.04

Hi

I have Dkim installed and running.

But virtualmin module not open.

1st error is not found /etc/dkim-filter.conf

I create one simbolic link

now i still have this error

"DomainKeys indentified mail is not available on this system : The DKIM filter server boot script dkim-filter does not exist However, Virtualmin can attempt to automatically install the DKIM filter package for you."

 opendkim.service - OpenDKIM DomainKeys Identified Mail (DKIM) Milter
   Loaded: loaded (/lib/systemd/system/opendkim.service; enabled; vendor preset: enabled)
   Active: active (running) since Tue 2018-05-01 17:58:56 WEST; 1 day 3h ago
     Docs: man:opendkim(8)
           man:opendkim.conf(5)
           man:opendkim-genkey(8)
           man:opendkim-genzone(8)
           man:opendkim-testadsp(8)
           man:opendkim-testkey
           http://www.opendkim.org/docs.html
 Main PID: 14739 (opendkim)
    Tasks: 7 (limit: 2310)
   CGroup: /system.slice/opendkim.service
           └─14739 /usr/sbin/opendkim -x /etc/opendkim.conf

I have all packages installed and running.

open dkim is running on socket 8891.

Any help?