Rsync app stopped No containers are available

I installed the rsync app and went through the configuration for it. There is nothing about setting up a container in the rsync config. every time I try to start it I get “deploying” then status is stopped and I see the message above. “No containers are available”

I am using ElectricEel-24.10.2.1

I’m not sure how to attack this issue. I did not know apps were using docker under the covers and am not sure how to “add” a container for rsync to use.
any ideas?