Fresh NCP Docker install hangs: Could not open input file: /var/www/nextcloud/occ

trying to set up the latest NCP Docker.

docker run -d -p 4443:4443 -p 451:443 -p 91:80 -v /srv/dev-disk-by-label-main/appdata/nextcloudpi:/data --name nextcloudpi ownyourbits/nextcloudpi-armhf ncp.xxxxxx

Docker installation keeps hanging with this output:
I also tried with an older version (nextcloudpi-armhf:v1.20.1), same problem.

Starting PHP-fpm
Starting Apache
Starting mariaDB
2020-03-28 6:29:52 0 [Note] mysqld (mysqld 10.3.22-MariaDB-0+deb10u1) starting as process 115 …
Starting Redis
Starting Cron
Starting Postfix
Uninitialized instance, running nc-init…
Running nc-init
Setting up a clean Nextcloud instance… wait until message ‘NC init done’
Setting up database…
Setting up Nextcloud…
Could not open input file: /var/www/nextcloud/occ


Many thanks!!!

Try mounting to an existing volume, the PATH your using does not look right.
Check mounting methods in docs