Hi dears, 

I am trying run openproject in my ubuntu machine using "docker-compose up -d" and I get the error below:

sudo docker-compose up -d

ERROR: Invalid interpolation format for "environment" option in service "cron": "OPENPROJECT_RAILS__RELATIVE__URL__ROOT=${OPENPROJECT_RAILS__RELATIVE__URL__ROOT:-}"

Could someone help me with that?

Thanks

Hello, can you share your docker-compose version, and update it? I believe you are running on an older version

I'm getting the same error.  I followed the instructions from here:  https://docs.openproject.org/installation-and-operations/installation/docker/

My docker-compose details:

docker-compose version 1.17.1, build unknown
docker-py version: 2.5.1
CPython version: 2.7.17
OpenSSL version: OpenSSL 1.1.1  11 Sep 2018

I upgraded docker-compose to 1.26.0-rc3 and it worked.