Use of uninitialized value in numeric gt (>) at /usr/local/share/perl/5.10.0/PDF/API2/Basic/TTF/Cmap.pm line 258.
Steps followed :

my $font_dir = '/usr/share/fonts/opentype';
my $pdf = PDF::API2->new( -file => $args[0] );
$pdf->mediabox('Letter');
PDF::API2::addFontDirs($font_dir);
my $f3 = $pdf->ttfont('TrajanPro-Bold.otf', -encoding=>'latin1');