Mpdf\MpdfException: Temporary files directory "/var/www/kalender/src/Service/../../var/tmp/mpdf/ttfontdata" is not writable in /var/www/kalender/vendor/mpdf/mpdf/src/Cache.php:21
Stack trace:
#0 /var/www/kalender/vendor/mpdf/mpdf/src/ServiceFactory.php(68): Mpdf\Cache->__construct()
#1 /var/www/kalender/vendor/mpdf/mpdf/src/Mpdf.php(1084): Mpdf\ServiceFactory->getServices()
#2 /var/www/kalender/src/Service/DfxNfxFunctions.php(93): Mpdf\Mpdf->__construct()
#3 /var/www/kalender/src/Controller/DfxKalenderController.php(1569): App\Service\DfxNfxFunctions->writePdf()
#4 /var/www/kalender/vendor/symfony/http-kernel/HttpKernel.php(163): App\Controller\DfxKalenderController->pdfAction()
#5 /var/www/kalender/vendor/symfony/http-kernel/HttpKernel.php(75): Symfony\Component\HttpKernel\HttpKernel->handleRaw()
#6 /var/www/kalender/vendor/symfony/http-kernel/Kernel.php(202): Symfony\Component\HttpKernel\HttpKernel->handle()
#7 /var/www/kalender/web/index.php(23): Symfony\Component\HttpKernel\Kernel->handle()
#8 {main}