@Marvin my flow on prefect 3.x is receiving Encountered exception during execution: KeyError(0) error. I've placed my variables on UI section, but is still not readed.

It seems like your issue may be related to the handling of variables in Prefect 3.x. The documentation mentions the correct way to manage variables through the Prefect UI, but it's possible there was a misconfiguration. Here are some key points from the Prefect 3.0 documentation on variables: - Variables in Prefect are dynamically-named, mutable string values that are scoped to a single workspace in a Prefect Cloud account or a self-hosted Prefect server instance. - They must have no more than 255 characters, and only contain lowercase alphanumeric characters ([a-z], [0-9]) or underscores (_). Spaces are not allowed and they should be unique. - Values should be less than or equal to 5000 characters. Here’s how you can troubleshoot and ensure you've properly set up your variables: 1. Verify Variable Names: Ensure that your variable names adhere to the naming conventions mentioned above. 2. Check Variable Values: Confirm that your variable values are within the character limit. 3. Access Variables Programmatically: Instead of relying on the UI, you can access your variables programmatically to double-check that they are being read correctly. Here's an example of how to access a variable in a Prefect flow:

python
from prefect import flow, get_run_context

@flow
def example_flow():
    ctx = get_run_context()
    my_var = ctx.variables.get("my_variable_name", default_value="default_value")
    print(my_var)

example_flow()

This will help you ensure that the variable is indeed being read by your flow. If you still encounter issues, refer to the Prefect 3.x troubleshooting page. Hopefully, these steps help you resolve the

KeyError

. If the issue persists, please provide more details or specific error messages, and we can dive deeper.