Wekan failed to build (docker)

I was able to install Wekan via snap but now I am trying with docker using this guide: https://github.com/wekan/wekan/wiki/Docker

1. I made a new /wekan directory in user wekan's home
2. Edited the docker-compose.yml file to look like this:

#-------------------------------------------------------------------------------------
# ==== BUILD wekan-app DOCKER CONTAINER FROM SOURCE, if you uncomment these ====
    # ==== and use commands: docker-compose up -d --build
    build:
      context: .
      dockerfile: Dockerfile
      args:
        - NODE_VERSION=${NODE_VERSION}
        - METEOR_RELEASE=${METEOR_RELEASE}
        - NPM_VERSION=${NPM_VERSION}
        - ARCHITECTURE=${ARCHITECTURE}
        - SRC_PATH=${SRC_PATH}
        - METEOR_EDGE=${METEOR_EDGE}
        - USE_EDGE=${USE_EDGE}
    #------------------------------------------------------------------------------------

3.Use the command 'docker-compose up -d --build' and this runs for a while until the message: "Service 'wekan' failed to build:... "

Not sure where to go from here. Any help would be appreciated, thank you.