Error 500 during user registration

[rb10]

during user registration i have error 500 page on the front-end, but on the back-end user are registred normally, what can depend this problem ? 

[ComGrafPL]

Enable debug mode and retry with registration.

[rb10]

i see this message : 

Fatal error: Uncaught Error: Call to undefined function proc_open() in /web/htdocs/namesite/home/shop/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/StreamBuffer.php:291 Stack trace: #0 /web/htdocs/namesite/home/shop/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/StreamBuffer.php(54): Swift_Transport_StreamBuffer->establishProcessConnection() #1 /web/htdocs/namesite/home/shop/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php(143): Swift_Transport_StreamBuffer->initialize() #2 /web/htdocs/namesite/home/shop/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/SendmailTransport.php(50): Swift_Transport_AbstractSmtpTransport->start() #3 /web/htdocs/namesite/home/shop/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Mailer.php(65): Swift_Transport_SendmailTransport->start() #4 /web/htdocs/namesite/home/shop/classes/Mail.php(636): Swift_Mailer->send() #5 /web/htdocs/namesite/home/shop/classes/form/CustomerPersister.php(261): MailCore::send() #6 /web/htdocs/namesite/home/shop/classes/form/CustomerPersister.php(239): CustomerPersisterCore->sendConfirmationMail() #7 /web/htdocs/namesite/home/shop/classes/form/CustomerPersister.php(69): CustomerPersisterCore->create() #8 /web/htdocs/namesite/home/shop/classes/form/CustomerForm.php(262): CustomerPersisterCore->save() #9 /web/htdocs/namesite/home/shop/controllers/front/RegistrationController.php(64): CustomerFormCore->submit() #10 /web/htdocs/namesite/home/shop/classes/controller/Controller.php(319): RegistrationControllerCore->initContent() #11 /web/htdocs/namesite/home/shop/classes/Dispatcher.php(510): ControllerCore->run() #12 /web/htdocs/namesite/home/shop/index.php(28): DispatcherCore->dispatch() #13 {main} thrown in /web/htdocs/namesite/home/shop/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/StreamBuffer.php on line 291

[Prestashop Addict]

Please indicate always more context like PS version. This is a hosting provider issue, the php function proc_open() is not allowed in your php environnement. Ask your hosting support.

Edited April 21 by Prestashop Addict (see edit history)

[rb10]

PS 8.1.2

PHP 8.3.2