And here is grav.log
[2021-02-04 07:07:19] grav.CRITICAL: Process could not be started [Het systeem kan het opgegeven pad niet vinden. ] - Trace: #0 C:\Users\haarm\Documents\Sites\Curiosity\user\plugins\email\vendor\swiftmailer\swiftmailer\lib\classes\Swift\Transport\StreamBuffer.php(54): Swift_Transport_StreamBuffer->establishProcessConnection() #1 C:\Users\haarm\Documents\Sites\Curiosity\user\plugins\email\vendor\swiftmailer\swiftmailer\lib\classes\Swift\Transport\AbstractSmtpTransport.php(143): Swift_Transport_StreamBuffer->initialize(Array) #2 C:\Users\haarm\Documents\Sites\Curiosity\user\plugins\email\vendor\swiftmailer\swiftmailer\lib\classes\Swift\Transport\SendmailTransport.php(50): Swift_Transport_AbstractSmtpTransport->start() #3 C:\Users\haarm\Documents\Sites\Curiosity\user\plugins\email\vendor\swiftmailer\swiftmailer\lib\classes\Swift\Mailer.php(65): Swift_Transport_SendmailTransport->start() #4 C:\Users\haarm\Documents\Sites\Curiosity\user\plugins\email\classes\Email.php(110): Swift_Mailer->send(Object(Swift_Message)) #5 C:\Users\haarm\Documents\Sites\Curiosity\user\plugins\email\email.php(163): Grav\Plugin\Email\Email->send(Object(Swift_Message)) #6 C:\Users\haarm\Documents\Sites\Curiosity\user\plugins\email\email.php(105): Grav\Plugin\EmailPlugin->sendFormEmail(Object(Grav\Plugin\Form\Form), Array, Array) #7 C:\Users\haarm\Documents\Sites\Curiosity\vendor\symfony\event-dispatcher\EventDispatcher.php(264): Grav\Plugin\EmailPlugin->onFormProcessed(Object(RocketTheme\Toolbox\Event\Event), 'onFormProcessed', Object(Symfony\Component\EventDispatcher\EventDispatcher)) #8 C:\Users\haarm\Documents\Sites\Curiosity\vendor\symfony\event-dispatcher\EventDispatcher.php(239): Symfony\Component\EventDispatcher\EventDispatcher->doDispatch(Array, 'onFormProcessed', Object(RocketTheme\Toolbox\Event\Event)) #9 C:\Users\haarm\Documents\Sites\Curiosity\vendor\symfony\event-dispatcher\EventDispatcher.php(73): Symfony\Component\EventDispatcher\EventDispatcher->callListeners(Array, 'onFormProcessed', Object(RocketTheme\Toolbox\Event\Event)) #10 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Common\Grav.php(537): Symfony\Component\EventDispatcher\EventDispatcher->dispatch(Object(RocketTheme\Toolbox\Event\Event), 'onFormProcessed') #11 C:\Users\haarm\Documents\Sites\Curiosity\user\plugins\form\classes\Form.php(919): Grav\Common\Grav->fireEvent('onFormProcessed', Object(RocketTheme\Toolbox\Event\Event)) #12 C:\Users\haarm\Documents\Sites\Curiosity\user\plugins\form\form.php(275): Grav\Plugin\Form\Form->post() #13 C:\Users\haarm\Documents\Sites\Curiosity\vendor\symfony\event-dispatcher\EventDispatcher.php(264): Grav\Plugin\FormPlugin->onPageInitialized(Object(RocketTheme\Toolbox\Event\Event), 'onPageInitializ...', Object(Symfony\Component\EventDispatcher\EventDispatcher)) #14 C:\Users\haarm\Documents\Sites\Curiosity\vendor\symfony\event-dispatcher\EventDispatcher.php(239): Symfony\Component\EventDispatcher\EventDispatcher->doDispatch(Array, 'onPageInitializ...', Object(RocketTheme\Toolbox\Event\Event)) #15 C:\Users\haarm\Documents\Sites\Curiosity\vendor\symfony\event-dispatcher\EventDispatcher.php(73): Symfony\Component\EventDispatcher\EventDispatcher->callListeners(Array, 'onPageInitializ...', Object(RocketTheme\Toolbox\Event\Event)) #16 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Common\Grav.php(537): Symfony\Component\EventDispatcher\EventDispatcher->dispatch(Object(RocketTheme\Toolbox\Event\Event), 'onPageInitializ...') #17 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Common\Processors\PagesProcessor.php(44): Grav\Common\Grav->fireEvent('onPageInitializ...', Object(RocketTheme\Toolbox\Event\Event)) #18 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Framework\RequestHandler\Traits\RequestHandlerTrait.php(50): Grav\Common\Processors\PagesProcessor->process(Object(Nyholm\Psr7\ServerRequest), Object(Grav\Framework\RequestHandler\RequestHandler)) #19 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Framework\RequestHandler\Traits\RequestHandlerTrait.php(62): Grav\Framework\RequestHandler\RequestHandler->handle(Object(Nyholm\Psr7\ServerRequest)) #20 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Common\Processors\TwigProcessor.php(38): Grav\Framework\RequestHandler\RequestHandler->handle(Object(Nyholm\Psr7\ServerRequest)) #21 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Framework\RequestHandler\Traits\RequestHandlerTrait.php(50): Grav\Common\Processors\TwigProcessor->process(Object(Nyholm\Psr7\ServerRequest), Object(Grav\Framework\RequestHandler\RequestHandler)) #22 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Framework\RequestHandler\Traits\RequestHandlerTrait.php(62): Grav\Framework\RequestHandler\RequestHandler->handle(Object(Nyholm\Psr7\ServerRequest)) #23 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Common\Processors\AssetsProcessor.php(39): Grav\Framework\RequestHandler\RequestHandler->handle(Object(Nyholm\Psr7\ServerRequest)) #24 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Framework\RequestHandler\Traits\RequestHandlerTrait.php(50): Grav\Common\Processors\AssetsProcessor->process(Object(Nyholm\Psr7\ServerRequest), Object(Grav\Framework\RequestHandler\RequestHandler)) #25 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Framework\RequestHandler\Traits\RequestHandlerTrait.php(62): Grav\Framework\RequestHandler\RequestHandler->handle(Object(Nyholm\Psr7\ServerRequest)) #26 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Common\Processors\SchedulerProcessor.php(40): Grav\Framework\RequestHandler\RequestHandler->handle(Object(Nyholm\Psr7\ServerRequest)) #27 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Framework\RequestHandler\Traits\RequestHandlerTrait.php(50): Grav\Common\Processors\SchedulerProcessor->process(Object(Nyholm\Psr7\ServerRequest), Object(Grav\Framework\RequestHandler\RequestHandler)) #28 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Framework\RequestHandler\Traits\RequestHandlerTrait.php(62): Grav\Framework\RequestHandler\RequestHandler->handle(Object(Nyholm\Psr7\ServerRequest)) #29 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Common\Processors\BackupsProcessor.php(39): Grav\Framework\RequestHandler\RequestHandler->handle(Object(Nyholm\Psr7\ServerRequest)) #30 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Framework\RequestHandler\Traits\RequestHandlerTrait.php(50): Grav\Common\Processors\BackupsProcessor->process(Object(Nyholm\Psr7\ServerRequest), Object(Grav\Framework\RequestHandler\RequestHandler)) #31 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Framework\RequestHandler\Traits\RequestHandlerTrait.php(62): Grav\Framework\RequestHandler\RequestHandler->handle(Object(Nyholm\Psr7\ServerRequest)) #32 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Common\Processors\TasksProcessor.php(69): Grav\Framework\RequestHandler\RequestHandler->handle(Object(Nyholm\Psr7\ServerRequest)) #33 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Framework\RequestHandler\Traits\RequestHandlerTrait.php(50): Grav\Common\Processors\TasksProcessor->process(Object(Nyholm\Psr7\ServerRequest), Object(Grav\Framework\RequestHandler\RequestHandler)) #34 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Framework\RequestHandler\Traits\RequestHandlerTrait.php(62): Grav\Framework\RequestHandler\RequestHandler->handle(Object(Nyholm\Psr7\ServerRequest)) #35 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Common\Processors\RequestProcessor.php(63): Grav\Framework\RequestHandler\RequestHandler->handle(Object(Nyholm\Psr7\ServerRequest)) #36 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Framework\RequestHandler\Traits\RequestHandlerTrait.php(50): Grav\Common\Processors\RequestProcessor->process(Object(Nyholm\Psr7\ServerRequest), Object(Grav\Framework\RequestHandler\RequestHandler)) #37 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Framework\RequestHandler\Traits\RequestHandlerTrait.php(62): Grav\Framework\RequestHandler\RequestHandler->handle(Object(Nyholm\Psr7\ServerRequest)) #38 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Common\Processors\ThemesProcessor.php(38): Grav\Framework\RequestHandler\RequestHandler->handle(Object(Nyholm\Psr7\ServerRequest)) #39 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Framework\RequestHandler\Traits\RequestHandlerTrait.php(50): Grav\Common\Processors\ThemesProcessor->process(Object(Nyholm\Psr7\ServerRequest), Object(Grav\Framework\RequestHandler\RequestHandler)) #40 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Framework\RequestHandler\Traits\RequestHandlerTrait.php(62): Grav\Framework\RequestHandler\RequestHandler->handle(Object(Nyholm\Psr7\ServerRequest)) #41 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Common\Processors\PluginsProcessor.php(39): Grav\Framework\RequestHandler\RequestHandler->handle(Object(Nyholm\Psr7\ServerRequest)) #42 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Framework\RequestHandler\Traits\RequestHandlerTrait.php(50): Grav\Common\Processors\PluginsProcessor->process(Object(Nyholm\Psr7\ServerRequest), Object(Grav\Framework\RequestHandler\RequestHandler)) #43 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Framework\RequestHandler\Traits\RequestHandlerTrait.php(62): Grav\Framework\RequestHandler\RequestHandler->handle(Object(Nyholm\Psr7\ServerRequest)) #44 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Common\Processors\InitializeProcessor.php(128): Grav\Framework\RequestHandler\RequestHandler->handle(Object(Nyholm\Psr7\ServerRequest)) #45 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Common\Debugger.php(546): Grav\Common\Processors\InitializeProcessor::Grav\Common\Processors\{closure}() #46 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Common\Processors\InitializeProcessor.php(129): Grav\Common\Debugger->profile(Object(Closure)) #47 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Framework\RequestHandler\Traits\RequestHandlerTrait.php(50): Grav\Common\Processors\InitializeProcessor->process(Object(Nyholm\Psr7\ServerRequest), Object(Grav\Framework\RequestHandler\RequestHandler)) #48 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Framework\RequestHandler\Traits\RequestHandlerTrait.php(62): Grav\Framework\RequestHandler\RequestHandler->handle(Object(Nyholm\Psr7\ServerRequest)) #49 C:\Users\haarm\Documents\Sites\Curiosity\system\src\Grav\Common\Grav.php(282): Grav\Framework\RequestHandler\RequestHandler->handle(Object(Nyholm\Psr7\ServerRequest)) #50 C:\Users\haarm\Documents\Sites\Curiosity\index.php(58): Grav\Common\Grav->process() #51 {main} [] []