Cannot connect to the Docker daemon

[mridah]

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I'm trying to execute the command

docker exec -it fireball bash /generate.sh test.json

However, I keep getting the following error :

Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

I'm not running the cron job from the web portal so it shouldn't be a problem of docker not being installed on the crontab-ui docker container.

This is what I'm trying to achieve :

Any idea what might be causing the issue??