Thank you keszler, I have changed that but now I get a different error message:
Can't call method "text" without a package or object reference at /usr/share/perl5/PDF/API2/Simple.pm line 435.
I have included adjusted test code below. 
#!/usr/bin/perl
use strict "vars";
use PDF::API2::Simple;

# Start new PDF
    my $page_number = 1;
    my $pdf = PDF::API2::Simple->new(
        file => 'test.pdf',
        header => \&header,
        footer => \&footer
        );
# Set a custom font
    my $font_obj = $pdf->pdf->ttfont('FreeMono.ttf');
    $pdf->add_font('MonoFont',$font_obj);
# Add a page to the PDF
    $pdf->add_page();
# Insert some text
    # Set text color
        $pdf->fill_color( '#000000' );
    for (my $i = 0; $i < 35; $i++) {
        my $text = "$i - Example text";
        $pdf->text(
        $text,
        x => $pdf->margin_left,
        autoflow => 'on'
        );
    }
# Save PDF to disk
    $pdf->save();

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In reply to Re^2: External font with PDF::API2::Simple by Iceman1
in thread External font with PDF::API2::Simple by Iceman1

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