No certificat install possible crash

I have a older installed test system this is working with Letsencrypt Certificates, now I like to install loolwsd and CODE on my new installed Nextcloud Server but when I install

loolconfig set ssl.cert_file_path /etc/letsencrypt/live/xxxx.xxxxxx.xx/fullchain-ecdsa.pem or any other certificate

the loolwsd crash on start with “permission denied” the same certificate is working with apache ?

can any help please or is this a ERROR ?

thanks Günther