LDIF Modify errors

[<CZa...@wi...>]

Hello, can anyone help with the LDIF class.

I'm am reading a ldif file and trying to place the contents into a DB, but
I am getting errors and the modify updates are not
being applied to the LDAP service.


ERROR Message:
modifytimestamp attribute has duplicate value. VALUE:   at ldif_modify.pl
line 20, <GEN1> chunk 1.

CODE:
#!/usr/bin/perl -w

use Net::LDAP qw(:all);
use Net::LDAP::Util qw(ldap_error_desc);
use Net::LDAP::LDIF;


        $ldap = Net::LDAP->new('server.xyz.com', port => '389') || die
"ERROR: $@";
        $ldif = Net::LDAP::LDIF->new("out.ldif", "r") || die "$@";


while ( $entry = $ldif->read_entry ) {

        $r = $ldap->modify( $entry );
        if ($r->code) {
                warn $entry->dn,"; ",$r->error;
        } else {
                printf "%s\n",ldap_error_desc($r->code);
        }
}