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Getting a strange new error during flow submission: `Submission failed. botocore.exceptions.ParamValidationError: Parameter validation failed: Unknown parameter in input: "deregisteredAt", must be one of: family, taskRoleArn, executionRoleArn, networkMode, containerDefinitions, volumes, placementConstraints, requiresCompatibilities, cpu, memory, tags, pidMode, ipcMode, proxyConfiguration, inferenceAccelerators, ephemeralStorage, runtimePlatform`

I don’t get this error if I deploy the flows locally, but when the flows are deployed from circleci, this error is generated.

Is this for Prefect 1 or 2? Do you have the ECS configuration that you can share?

```# Get the revision of the task_definition_arn
result = ecs_client.list_task_definitions(
    familyPrefix='prefect2_artemis_ecs_task',
    status='active',
    maxResults=1,
    sort='DESC',
)
task_def_arn = result['taskDefinitionArns'][0]

ecs_task_block = ECSTask(
    task_definition_arn=task_def_arn,
    cluster=f'{env}-prefect-cluster',
    vpc_id=vpcs[env],
    task_customizations=[
        {
            "op": "add",
            "path": "/networkConfiguration",
            "value": {
                "awsvpcConfiguration": {
                    "subnets" : subnets[env],
                    "securityGroups" : security_groups[env],
                    "assignPublicIp" : "DISABLED"
                }
            }
        }
    ],
    configure_cloudwatch_logs=True,
    stream_output=True,
)
ecs_task_block.save(f'{env}-artemis-ecs-block', overwrite=True)```
ECS block.

```boto3==1.26.66
botocore==1.29.66
prefect==2.7.0
prefect-aws==0.2.1```

Are the ECSTask and AWSCredentials blocks being registered in the CircleCI environment? (the third bullet point in <https://docs.prefect.io/concepts/infrastructure/?h=ecstask#ecstask|this doc>)

Yes for ECSTask block. Not using AWSCredentials block, I don’t think that’s required.

I have a similar circleci setup for another project using prefect2 and that has been working fine.

I just realized that it’s possible that `PREFECT_API_URL` is missing in this project’s setup. I’ll try setting that.

It worked after setting `PREFECT_API_URL`. Difficult to get there from the error message above! :slightly_smiling_face: Thanks a lot for your help!