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After change PHP version to 8.1 I have a error in the same place:
 

Fatal error: Uncaught Error: Call to undefined function proc_open() in /home/compsoul/domains/skate.compsoul.pl/public_html/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/StreamBuffer.php:291 Stack trace: #0 /home/compsoul/domains/skate.compsoul.pl/public_html/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/StreamBuffer.php(54): Swift_Transport_StreamBuffer->establishProcessConnection() #1 /home/compsoul/domains/skate.compsoul.pl/public_html/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php(143): Swift_Transport_StreamBuffer->initialize() #2 /home/compsoul/domains/skate.compsoul.pl/public_html/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/SendmailTransport.php(50): Swift_Transport_AbstractSmtpTransport->start() #3 /home/compsoul/domains/skate.compsoul.pl/public_html/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Mailer.php(65): Swift_Transport_SendmailTransport->start() #4 /home/compsoul/domains/skate.compsoul.pl/public_html/classes/Mail.php(627): Swift_Mailer->send() #5 /home/compsoul/domains/skate.compsoul.pl/public_html/modules/ps_emailalerts/ps_emailalerts.php(529): MailCore::send() #6 /home/compsoul/domains/skate.compsoul.pl/public_html/classes/Hook.php(968): Ps_EmailAlerts->hookActionValidateOrder() #7 /home/compsoul/domains/skate.compsoul.pl/public_html/classes/Hook.php(407): HookCore::coreCallHook() #8 /home/compsoul/domains/skate.compsoul.pl/public_html/classes/Hook.php(903): HookCore::callHookOn() #9 /home/compsoul/domains/skate.compsoul.pl/public_html/classes/PaymentModule.php(558): HookCore::exec() #10 /home/compsoul/domains/skate.compsoul.pl/public_html/modules/ps_wirepayment/controllers/front/validation.php(63): PaymentModuleCore->validateOrder() #11 /home/compsoul/domains/skate.compsoul.pl/public_html/classes/controller/Controller.php(308): Ps_WirepaymentValidationModuleFrontController->postProcess() #12 /home/compsoul/domains/skate.compsoul.pl/public_html/classes/Dispatcher.php(503): ControllerCore->run() #13 /home/compsoul/domains/skate.compsoul.pl/public_html/index.php(28): DispatcherCore->dispatch() #14 {main} thrown in /home/compsoul/domains/skate.compsoul.pl/public_html/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/StreamBuffer.php on line 291