Command "prefect" not found on ECS Fargate Task


I’ve created a simple Task Definition to run an agent on ECS Fargate as a Service.
When the service starts I am getting “command not found”.
It is as if the prefect python library is not installed.

I am using the image:

The task definition:

This is the default configuration and I haven’t touched anything else.
Just picked the image, add the 3 env vars, and entered the command to run: “prefect -v”.

Any idea what is missing here?
Maybe a “pip install”? (but the image should have everything already prepared…)

Thank you for any help on the issue.

OK, solved it.
It should be a single line separated by commas: