Sentry can not install

hi,
i try to setup sentry on ubuntu 20.04.

I followed this link https://www.howtoforge.com/how-to-install-sentry-with-docker-on-ubuntu-1804/.
. sentry_services.sh
i got
Unable to find image ‘sentry-onpremise:latest’ locally
docker: Error response from daemon: pull access denied for sentry-onpremise, rep ository does not exist or may require ‘docker login’: denied: requested access t o the resource is denied.

how to fix it?

i tried
docker-compose build --pull --force-rm web
ERROR: Invalid interpolation format for “smtp” option in service “services”: “${ SENTRY_MAIL_HOST:-}”
docker-compose build --force-rm
ERROR: Invalid interpolation format for “smtp” option in service “services”: “${ SENTRY_MAIL_HOST:-}”