Using External Librarys

I am trying to use dompdf to create some custom PDF reports I need…
I tried tcpdf and it messes up the format of the html I pass it…

So I have loaded the external library and and click use library…

then I created a blank app and added some html code like below BUT I keep getting error like:
Fatal error: Uncaught Error: Class ‘Dompdf’ not found in C:\Program Files\NetMake\v9-php73\ww…

I am sure I am not including the files right but I cant figure out how to do it correctly…

my sample code:

sc_include_library(“prj”, ‘’, “dompdf/src/Autoloader.php”, true, true);
sc_include(“Dompdf”, “prj”);
$dompdf = new Dompdf();

$html = ‘TEST PDF TEXT’;

$dompdf->loadHtml($html);
$dompdf->setPaper(‘A4’, ‘portrait’);
$dompdf->render();
$dompdf->stream(“Webslesson”, array(“Attachment”=>0));