# My Set Method
sub set_hshAgg {
    my $self = shift;
    my %hshAgg = shift;        <-------- use of %
    $self->{hshAgg} = %hshAgg;
}

# Your Set Method
sub set_hshAgg {
    my $self = shift;
    my $hshAgg = shift;        <-------- use of $
    $self->{hshAgg} = %hshAgg;
}