Hi all,
I have this same issue with the new installation and I added wild card private.key and certificate.crt files BEFORE starting bitwarden and no luck.
`2019/06/27 10:02:12 [emerg] 1#1: cannot load certificate "/opt/bitwarden/bwdata/ssl/pass.risefx.com/certificate.crt": BIO_new_file() failed (SSL: error:02001002:system library:fopen:No such file or directory:fopen('/opt/bitwarden/bwdata/ssl/pass.risefx.com/certificate.crt','r') error:2006D080:BIO routines:BIO_new_file:no such file)`
root@pass:/opt/bitwarden/bwdata/logs/nginx# ll "/opt/bitwarden/bwdata/ssl/pass.risefx.com/certificate.crt"
-rw-r--r-- 1 nobody nogroup 2408 Jun 27 12:04 /opt/bitwarden/bwdata/ssl/pass.risefx.com/certificate.crt
I tried to change the permissions for the path and the files but no luck…
Thank You advanced… 
t:-j