Hi,
Problem is this code
package GroupSystem;
sub new {
my $class = shift;
my $self = [{}];
That uses a experimental feature called "pseudo hash" that was deprecated in Perl 5.8.0 (2002-Jul-18) removed in Perl 5.10.0 (2007-Dec-18)
Therefore, the fix is much simpler than presented in Re^3: Error with CPAN module XML-BMEcat,
the fix is to inherit from Class::PseudoHash
package GroupSystem;
use Class::PseudoHash;
@GroupSystem::ISA = 'Class::PseudoHash';
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