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When I import function for `pytest` which has perfect `decorator`,
I got the following error (screenshot bellow).
If I comment #flow decorator, pytest runs without errors.

Prefect uses Pydantic to validate flow’s parameters so this is probably something to do with that. Can you show a minimal example of your code?

Can you try setting `validate_parameters=False` and see if you still get the error?

Thank you <@U03GUVCV8DS>!
I've tried a `validate_parameters=False`, but it didn't have influence.
I will try to create a simple code example.

<@U03GUVCV8DS>,
Just sharing, and all otheres, who is interested, to what I discovered:
1. Thre problem *raises*, when one of the *dictionary values* is a `list`.
2. When I switched from version 2.4.5 to 2.6.9, the problem disappeared :partying_face:.

That’s interesting. We must have fixed this issue in the later versions. I’m glad you solved the issue!