I execute:
use DateTime;
use DateTime::Calendar::Coptic;
$day = DateTime->now();
my $co = DateTime::Calendar::Coptic->from_object(object => $day);
and I get
Undefined subroutine &DateTime::Calendar::Coptic::validate called
at /home/p80/perl/lib/site_perl/5.8.0/DateTime/Calendar/Coptic.pm
line 73.
Maybe you should insert "use Params::Validate" in your module
and change the subroutine invocation in line 73 (I have not the
time to try it for the moment).
Jean Forget
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