On the very first screen, the deploy fails with docker-compose not found

[KpuCko]

I have cloned the repository, and used the setup utility bash scripts/deploy-setup-utility.sh.
The Docker containers are up and running, but when I accessed the web page and hit the Deploy button I see these errors:

Connected to server
@deploy.sh: STEP 1...
/app/scripts/deploy.sh: line 15: docker-compose: command not found
/app/scripts/deploy.sh: line 16: docker-compose: command not found
/app/scripts/deploy.sh: line 17: docker-compose: command not found
@deploy.sh: STEP 2...
/app/scripts/deploy.sh: line 21: docker-compose: command not found
/app/scripts/deploy.sh: line 22: docker-compose: command not found
Error 127

How to fix that?
Thanks