Error when I set-up notification on configuration Php

Hi.

Until now, everything was working very well but, I want to set-up my configuration php to send automatically my form in pdf.
Now, I have that for each forms. It’s working but nothing is sent to me.

$gf_pdf_config[] = array(
	'form_id'        => 1,
	'template'       => 'formulaire_inscription_secretariat.php' /* you need to set this to your custom template name */
);

So I followed instruction ang got this code

$gf_pdf_config[] = array(
	'form_id'        => 1,
	'template'       => 'formulaire_inscription_secretariat.php' /* you need to set this to your custom template name */
	'filename'       => 'incription patients.pdf',
	'notification'   => true,
);

So now, I have an error 500 when I want to open my page. I still have access to my WordPress admin except if I try to go on “form”.

if I take out these 2 ligne (filename) and (notifications), I have access to my page.

do you have any idea about that ?

I’m using theme forest X

thx

https://www.ads-software.com/plugins/gravity-forms-pdf/