Symfony 4 built-in server - 'Warning: mkdir(): Permission denied'

Question

I'm working with the KnpSnappyBundle and on trying to create a PDF I get the 500 error Warning: mkdir(): Permission denied

I've looked around and found answers for this questions but they don't seem to specifically relate to the built-in server. I do think that this is a file permissions error but I do not know how to resolve it.

For context, below is the code that is triggering the error:

/**
 * @Route("/", name="home")
 */
function mainOverview() {



    return new Response(

        $this->get('knp_snappy.pdf')
             ->generate(
                'http://www.google.fr',
                '/pdf/test.pdf' // **500 error triggers here**
             ),
        200,
        array(
            'Content-Type'          => 'application/pdf',
            'Content-Disposition'   => 'attachment; filename="file.pdf"'
        )
    );

}

EDIT 1:

Clarified that this is probably a file permissions error, rather than a coding error.

Answer 1

The permission error is due to the fact that the owner of the process , the symfony server, does not have the permission to create folder under the root directory /

$this->get('knp_snappy.pdf') ->generate( 'http://www.google.fr', '/pdf/test.pdf' // 500 error triggers here )

So please change the directory where you generate pdf from '/pdf/test.pdf' to your home directory (~/define/your/path) or where you have permission to create destination directory solve this issue