Getting

Submission failed. KeyError: 'env'

when attempting a "Hello World" prefect flow on ECS Using the prefect-aws guide and using this invocation to build a deployment:

prefect deployment build run.py:main \
    -n jack-test-1 \
    -ib ecs-task/ecs-block \
    -sb s3/flow-storage-block \
    --pool some-pool \
    --override env.EXTRA_PIP_PACKAGES=prefect-aws

I suspect this is because env is set to

None

in your

ecs-block

block right now. If you use the UI to set env to

{}

, and then try your deployment command again, does it work? It looks like the default for

env

is supposed to be an empty dict, which would prevent this from happening. But I just created a new ECS block and my env was None, which I believe will cause the problem you saw right about here when it tries to look up

env

in the block document.

That was it! Thanks

You're welcome! Glad to hear it worked.