Fatal error: Uncaught exception 'RuntimeException' with message 'The exit status code '127' says something went wrong: stderr: "sh: xvfb-run: command not found " stdout: "" command: xvfb-run /usr/local/bin/wkhtmltopdf --image-quality 100 --header-html ~/web/esprit-du-voyage/web/pdf/layout_pdf_header.html --footer-html ~/web/esprit-du-voyage/web/pdf/layout_pdf_footer.html --lowquality '/home/clients/956d74ca136ab5d7f59cb09c4943cb64/tmp/knp_snappy5f90d1a7b7f437.29494062.html' '/home/clients/956d74ca136ab5d7f59cb09c4943cb64/tmp/knp_snappy5f90d1a7b80602.43213554.pdf'.' in /home/clients/956d74ca136ab5d7f59cb09c4943cb64/web/esprit-du-voyage/vendor/knplabs/knp-snappy/src/Knp/Snappy/AbstractGenerator.php:336 Stack trace: #0 /home/clients/956d74ca136ab5d7f59cb09c4943cb64/web/esprit-du-voyage/vendor/knplabs/knp-snappy/src/Knp/Snappy/AbstractGenerator.php(151): Knp\Snappy\AbstractGenerator->checkProcessStatus(127, NULL, 'sh: xvfb-run: c...', 'xvfb-run /usr/l...') #1 /home/clients/956d74ca136ab5d7f59cb09c4943cb64/web/esprit-du-voyage in /home/clients/956d74ca136ab5d7f59cb09c4943cb64/web/esprit-du-voyage/vendor/symfony/symfony/src/Symfony/Bundle/TwigBundle/Loader/FilesystemLoader.php on line 91