Stats table cannot be exported in Japanese locale (Bug #38)

I updated ja.po for exporting statistics table and found "Export" button does not write any file when I ticked "Stats table" box in Japanese locale.

Launching AMC-export.pl by hand using xml argument file remained in /tmp, I got the following message:

$ LC_ALL=ja_JP.UTF-8 /usr/bin/perl /usr/local/lib/AMC/AMC-export.pl --xmlargs /tmp/AMC-PACK-OCnwh5oW.xml
Cannot decode string with wide characters at /usr/local/lib/perl5/5.12.4/mach/Encode.pm line 174.

In my perl installation (on FreeBSD 8.1), line 174 of Encode.pm calls $enc->decode() in sub decode().

164: sub decode($$;$) {
165:     my ( $name, $octets, $check ) = @_;
166:     return undef unless defined $octets;
167:     $octets .= '' if ref $octets;
168:     $check ||= 0;
169:     my $enc = find_encoding($name);
170:     unless ( defined $enc ) {
171:         require Carp;
172:         Carp::croak("Unknown encoding '$name'");
173:     }
174:     my $string = $enc->decode( $octets, $check );
175:     $_[1] = $octets if $check and !ref $check and !( $check & LEAVE_SRC() );
176:     return $string;
177: }

Please let me know if you need any other information.