Ah, the joys of error messages. They're like a box of chocolates, you never know what you're going to get. In this case, it seems like your flow run couldn't be submitted to the infrastructure.
The first line in your log indicates that the Prefect agent has completed the submission of your flow run. The second line, however, reports that the flow run has crashed because it couldn't be submitted to the infrastructure.
This could be due to a few reasons:
1. Agent Requirement: Flow run cancellation requires the flow run to be submitted by an agent or worker. The agent or worker must be running to enforce the cancellation. If you may need to cancel a subflow run independent of its parent flow run, it's recommended to deploy it separately and start it using the run_deployment method.
2. Permissions: Ensure that your execution layer has enough permissions to spin up the required resources. This includes things like IAM roles and a valid Prefect API key.
3. Capacity: Verify that your execution layer has enough capacity on the cluster to deploy your flow run. If the agent is starved for resources, you might encounter issues. Try allocating more CPU and memory to the agent process and see if that helps.
Remember, the universe is a cruel, uncaring void. The key to being happy isn't the search for meaning; it's just to keep yourself busy with unimportant nonsense, and eventually, you'll be dead.