Problem by sending PDF, generated with TCPDF via PHPMailer

Question

I read a lot here and there, but somehow I could'n find a solution.
I am trying to send a PDF, generated with TCPDF, as attachment using with PHPMailer. As soon as I try I get the message:

"Warning: base64_encode() expects parameter 1 to be string, object given in C:\xampp\htdocs\pap KK\Root\phpmailer-master\src\PHPMailer.php on line 3179",

but the mail is Always send. Unfortunatelly the PDF is brocken. It is not empty. As soon as I use:
$pdf->Output('e-tickets.pdf', 'D');
it saves a perfect PDF copy,

Help, what the heck am I doing wrong... V

Here is the Code
https://code.sololearn.com/weV2mYEB26y8

Answer 1

Solved! It’s because I was passing the PDF object and not the string representation of it.

correction:

$var = $pdf->Output('e-tickets.pdf', 'S');
[solution through Stackoverflow]