Class not found trying to integrate TCPDF

Following the instructions here: https://forum.codeigniter.com/thread-754...#pid377974

I setup TCPDF, but upon running I am getting an error. As best I can tell I followed the instructions exactly (except for a slight name change). What am I missing?

Unzipped the file downloaded from GitHub into App/ThirdParty/TCPDF

Added a file (SBPdf.php) into App/Libraries:

PHP Code:

<?php

 namespace App\Libraries;

 use App\ThirdParty\TCPDF\Tcpdf;

 class SBPdf extends TCPDF {
 } 


Then in my controller I call it:

PHP Code:

public function testpdf()
 {
 $pdf = new SBPdf(PDF_PAGE_ORIENTATION, PDF_UNIT, PDF_PAGE_FORMAT, true, 'UTF-8', false);

etc, etc.... 


At that point I was getting an error: 'Class "App\Controllers\Admin\SBPdf" not found'

I then added this to my controller (app/Controllers/Admin/Services.php), which got me closer, I think:

PHP Code:

use App\Libraries\SBPdf; 


But this produces an error of: 'Class "App\ThirdParty\TCPDF\Tcpdf" not found' error.

Feel like I am missing something obvious as others have said it just works, so... Help!