PHP Warning, Images don't load.

Been working on this for an hour with no luck.
I'm using unraid, and trying to set this up behind a reverse proxy (`linuxserver/letsencrypt`). I can get to a login screen, however there's no images loaded, and an error is being thrown in the logs:


The login page looks like this:


This is the docker command used for the container, bear in mind it's for unraid:
`/usr/local/emhttp/plugins/dynamix.docker.manager/scripts/docker create --name='alteria-wallabag' --net='docker-secure' --cpuset-cpus='1,4,5' -e TZ="Pacific/Auckland" -e HOST_OS="Unraid" -e 'SYMFONY__ENV__DOMAIN__NAME'='https://wallabag.alteria.xyz' -v '/mnt/user/appdata/alteria-wallabag/data':'/var/www/wallabag/data':'rw' -v '/mnt/user/appdata/alteria-wallabag/images':'/var/www/wallabag/web/assets/images':'rw' 'wallabag/wallabag'`