about doh configuration

[Stephane Bortzmeyer]

On Tue, Nov 10, 2020 at 05:47:10PM +0900,
 Shuji Yoshida via Unbound-users <unbound-users at lists.nlnetlabs.nl> wrote 
 a message of 40 lines which said:

> error: error for cert file: /var/unbound/etc/certs/doh_server.pem
> error: error in SSL_CTX use_certificate_chain_file crypto error:02001002:system library:fopen:No such file or directory

Unbound configured to chroot and the certificate is not in the chroot
directory?