Anonymous function called in forbidden scalar context

[vit]

Dear Monks,
After starting using Parallel::ForkManager I am getting

Anonymous function called in forbidden scalar context; faulting at c:/
+ActivePerl/site/lib/Lingua/EN/Tagger.pm line 199

in Lingua::EN::Tagger in the following place:

sub add_tags {
        
        my ( $self, $text ) = @_;
        
        return unless $self->_valid_text( $text );

        my @text = $self->_clean_text( $text );
        my $t = $self->{'current_tag'}; # shortcut

### I am getting this in this line: #######
        my ( @tags ) = 
                map {   
                        $t = $self->_assign_tag( $t, $self->_clean_wor
+d( $_ )) 
                                || $self->{'unknown_word_tag'} || 'nn'
+;
                       "<$t>$_</$t>"
                } @text;
        $self->{'current_tag'} = $t;
        $self->_reset;
        return join ' ', @tags;
}

I printed out @text and it is fine. It may not be directly related to using Parallel::ForkManager. Data is correctly passed to tagger.
So what can cause this error? Any thoughts?

[choroba]

Are you (or your modules) using Memoize? Google returns many hits with this module.

[vit]

No

[kennethk]

Are you sure? From the source:

package Lingua::EN::Tagger;

our $VERSION = '0.16';

use warnings;
use strict;

use Carp;
use File::Spec;
use FileHandle;
use HTML::TokeParser;
use Lingua::Stem::En;
use Memoize;
use Storable;