Ignore what others say about @INC and PERL5LIB. It's not a problem loading Class::ReturnValue.
The docs say:
Returns a false value upon failure to
open or parse the file or data; this false value is a
Class::ReturnValue object and can be queried as to its
error_message.
so
my $cal = Data::ICal->new(filename => 'Calendar.ics');
should be
my $cal = Data::ICal->new(filename => 'Calendar.ics');
die "Can't open calendar: ".$cal->error_message()."\n" if !$cal;
I bet you'll the problem is that your script can't find Calendar.ics because the current directory isn't what you assume it to be.
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