'Heroku + DockHero

I'm facing some problems to deploy an application to DockHero. As you can see, I'm trying to run this command as heroku says in its documentation:

ubuntu@ip-***-**-**-**:~/syncfusion$ heroku dh:compose up -d -a APP_NAME

But this happens:

Unknow flag: --file
See 'docker --help'.

This is my dockhero-compose.yml file:

version: '3.4'
services:
  word-processor-server:
    image: syncfusion/word-processor-server:latest
    environment:
      SYNCFUSION_LICENSE_KEY: MY_LICENSE
    ports:
    - "6002:80"

What am I missing?

dockerheroku


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