Because accessing our internet is only limited at outside office hours, hence at our proxy squid is using Helping programs that is squidguard. This matter is done to facilitate arrangement access time.
Moment determine time access this through our Webmin meet mistake message like this:
Error - Perl Execution failed
Undefined Subroutine & main::chown called at / usr/libexec/webmin/squidguard/save_weekly.cgi lino 63
Undefined Subroutine & main::chown called at / usr/libexec/webmin/squidguard/save_weekly.cgi lino 63
I check file save_weekly.cgi at line 63 and change &chown($config{conf}) by & sgchown($config{conf}).
Error above disappearing.
This is simple tips from me hopefully good for reader.