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sub init_hash {
  my ($self) = @_;
...
  $self->{a_hash}{item4} = {name => 'd', value => '4'};
  1;
}

sub print_item3 {
  my ($self) = @_;
  print $self->{a_hash}{item3}{name} . " : " . $self->{a_hash}{item3}{
+value} . "\n";
}

sub print_all_hash {
  my ($self) = @_;
...
    print $self->{a_hash}{$item}{name} . " : " . $self->{a_hash}{$item
+}{value} . "\n";
  }
}

Type of arg 1 to keys must be hash (not hash element)