Editoria installation - ERROR: for job-pdf Cannot start service job-pdf

I am installing editoria-booksprints on Ubuntu 18.04.
I followed the steps mentioned from @alexgeorg on this post: "Installation problems "

At the final step, after the database has been setup and is started, http server started, but on the third terminal, after executing yarn start:services , I get the error:

ERROR: for job-pdf Cannot start service job-pdf: Decoding seccomp profile failed: invalid character ā€˜sā€™ looking for beginning of value
ERROR: Encountered errors while bringing up the project.
error Command failed with exit code 1.`

Thank you!

do you have the seccomp.json file at the root of your app?

Yes I do, as it is already on the git repository.

The error seems to be disappearing after installing Docker Compose . It turns out I have not clearly understand that they need to be installed both, Docker and Docker Compose !