Docker-compose, a n00b question - Cannot locate specified Dockerfile: Dockerfile

Hi,
sorry for my very n00b question.

I am using docker-compose in a local environment to get ready with the integration Inspircd+Anope+MySQL/SqlLite described here: https://hub.docker.com/r/anope/anope

Docker version 19.03.2
docker-compose version 1.21.0

I get an error when entering: docker-compose up -d

Pulling inspircd (inspircd/inspircd-docker:)...
latest: Pulling from inspircd/inspircd-docker
Digest: sha256:740f93c472557bb09800501faa5b0e819fe4acac9078e4103be89d036237f8a0
Status: Downloaded newer image for inspircd/inspircd-docker:latest
Pulling database (mysql:latest)...
latest: Pulling from library/mysql
Digest: sha256:6d95fa56e008425121e24d2c01b76ebbf51ca1df0bafb1edbe1a46937f4a149d
Status: Downloaded newer image for mysql:latest
Building services
Cannot locate specified Dockerfile: Dockerfile

Below my current docker-compose.yml. It’s based on the one linked on the example linked in the guide (https://github.com/Adam-/anope-docker/blob/master/examples/docker-compose.yml) which is also not working for me.

version: '2'
services:
  inspircd:
    image: inspircd/inspircd-docker
    volumes:
      - "./volume/inspircd/conf/:/inspircd/conf/"
      - "./volume/inspircd/logs/:/inspircd/logs/"
      - "./volume/inspircd/data/:/data/"
    #environment:
    # - "INSP_SERVICES_PASSWORD=password"
    # - "INSP_SERVICES_NAME=services.example.com"
    ports:
      - "56667:56667"
      - "56697:56697"
  services:
    image: anope:testing
    build: 
      context: ..
      args:
       - "VERSION=2.0.6"
    environment:
      - "ANOPE_SERVICES_NAME=services.example.com"
      - "ANOPE_UPLINK_IP=inspircd"
      - "ANOPE_UPLINK_PASSWORD=password"
      # comment the lines below to use sqlite instead
      - "ANOPE_SQL_ENGINE=mysql"
      - "ANOPE_MYSQL_PASSWORD=anope"
    depends_on:
      - inspircd
      - database
  database:
    image: mysql:latest
    volumes:
      - "./db:/var/lib/mysql"
    environment:
      - "MYSQL_RANDOM_ROOT_PASSWORD=yes"
      - "MYSQL_USER=anope"
      - "MYSQL_PASSWORD=anope"
      - "MYSQL_DATABASE=anope"

Do you have any idea? Thanks in advance.

the build context .. of the “services” service points to the parent folder.