Symfony file upload mysterious error

Uncaught PHP Exception Symfony\Component\HttpFoundation\File\Exception\FileNotFoundException: "The file "" does not exist" at /var/app/current/vendor/symfony/symfony/src/Symfony/Component/HttpFoundation/File/MimeType/MimeTypeGuesser.php line 116 {"exception":"[object] (Symfony\\Component\\HttpFoundation\\File\\Exception\\FileNotFoundException(code: 0): The file \"\" does not exist at /var/app/current/vendor/symfony/symfony/src/Symfony/Component/HttpFoundation/File/MimeType/MimeTypeGuesser.php:116)"}


If you see this error the odds are high that you are trying to upload a file larger than the max values set in you php.ini config file (upload_max_filesize and post_max_size).