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Fatal error: Uncaught Error: Call to undefined function Symfony\Component\Mailer\Transport\Smtp\Stream\proc_open() in /home/u404146051/domains/mathfuzzyjournal.com/public_html/lib/pkp/lib/vendor/symfony/mailer/Transport/Smtp/Stream/ProcessStream.php:41 Stack trace: #0 /home/u404146051/domains/mathfuzzyjournal.com/public_html/lib/pkp/lib/vendor/symfony/mailer/Transport/Smtp/SmtpTransport.php(251): Symfony\Component\Mailer\Transport\Smtp\Stream\ProcessStream->initialize() #1 /home/u404146051/domains/mathfuzzyjournal.com/public_html/lib/pkp/lib/vendor/symfony/mailer/Transport/Smtp/SmtpTransport.php(194): Symfony\Component\Mailer\Transport\Smtp\SmtpTransport->start() #2 /home/u404146051/domains/mathfuzzyjournal.com/public_html/lib/pkp/lib/vendor/symfony/mailer/Transport/AbstractTransport.php(69): Symfony\Component\Mailer\Transport\Smtp\SmtpTransport->doSend() #3 /home/u404146051/domains/mathfuzzyjournal.com/public_html/lib/pkp/lib/vendor/symfony/mailer/Transport/Smtp/SmtpTransport.php(136): Symfony\Component\Mailer\Transport\AbstractTransport->send() #4 /home/u404146051/domains/mathfuzzyjournal.com/public_html/lib/pkp/lib/vendor/symfony/mailer/Transport/SendmailTransport.php(74): Symfony\Component\Mailer\Transport\Smtp\SmtpTransport->send() #5 /home/u404146051/domains/mathfuzzyjournal.com/public_html/lib/pkp/classes/mail/Mailer.php(161): Symfony\Component\Mailer\Transport\SendmailTransport->send() #6 /home/u404146051/domains/mathfuzzyjournal.com/public_html/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Mail/Mailer.php(287): PKP\mail\Mailer->sendSymfonyMessage() #7 /home/u404146051/domains/mathfuzzyjournal.com/public_html/lib/pkp/classes/mail/Mailer.php(126): Illuminate\Mail\Mailer->send() #8 /home/u404146051/domains/mathfuzzyjournal.com/public_html/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Mail/Mailable.php(204): PKP\mail\Mailer->send() #9 /home/u404146051/domains/mathfuzzyjournal.com/public_html/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Support/Traits/Localizable.php(19): Illuminate\Mail\Mailable->Illuminate\Mail\{closure}() #10 /home/u404146051/domains/mathfuzzyjournal.com/public_html/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Mail/Mailable.php(197): Illuminate\Mail\Mailable->withLocale() #11 /home/u404146051/domains/mathfuzzyjournal.com/public_html/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Mail/Mailer.php(309): Illuminate\Mail\Mailable->send() #12 /home/u404146051/domains/mathfuzzyjournal.com/public_html/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Mail/Mailer.php(253): Illuminate\Mail\Mailer->sendMailable() #13 /home/u404146051/domains/mathfuzzyjournal.com/public_html/lib/pkp/classes/mail/Mailer.php(126): Illuminate\Mail\Mailer->send() #14 /home/u404146051/domains/mathfuzzyjournal.com/public_html/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Mail/MailManager.php(554): PKP\mail\Mailer->send() #15 /home/u404146051/domains/mathfuzzyjournal.com/public_html/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Support/Facades/Facade.php(338): Illuminate\Mail\MailManager->__call() #16 /home/u404146051/domains/mathfuzzyjournal.com/public_html/lib/pkp/classes/scheduledTask/ScheduledTaskHelper.php(243): Illuminate\Support\Facades\Facade::__callStatic() #17 /home/u404146051/domains/mathfuzzyjournal.com/public_html/lib/pkp/classes/scheduledTask/ScheduledTaskHelper.php(173): PKP\scheduledTask\ScheduledTaskHelper->_sendEmail() #18 /home/u404146051/domains/mathfuzzyjournal.com/public_html/lib/pkp/classes/scheduledTask/ScheduledTask.php(171): PKP\scheduledTask\ScheduledTaskHelper->notifyExecutionResult() #19 /home/u404146051/domains/mathfuzzyjournal.com/public_html/plugins/generic/acron/AcronPlugin.php(281): PKP\scheduledTask\ScheduledTask->execute() #20 /home/u404146051/domains/mathfuzzyjournal.com/public_html/plugins/generic/acron/AcronPlugin.php(195): APP\plugins\generic\acron\AcronPlugin->_shutdownFunction() #21 [internal function]: APP\plugins\generic\acron\AcronPlugin->APP\plugins\generic\acron\{closure}() #22 {main} thrown in /home/u404146051/domains/mathfuzzyjournal.com/public_html/lib/pkp/lib/vendor/symfony/mailer/Transport/Smtp/Stream/ProcessStream.php on line 41