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Prefect Community

It seems like there was a little hiccup with searching the Prefect documentation and GitHub issues. Let's investigate this systematically. 

When a flow that used to work starts throwing a `422 Unprocessable Entity` error, there could be several potential reasons for this:

1. *Schema Changes:* The API endpoint might have had a schema update that your current flow doesn't adhere to anymore. Recheck the setup and ensure all fields are correctly formatted and required fields are included.

2. *API Endpoint Changes:* Check if there have been any changes in the API endpoint URL itself or if the server configuration has changed.

3. *Prefect Version Update:* If you've updated Prefect recently, there may be changes that affect how data is sent to the API. Ensure you're using the latest syntax or API endpoints compatible with your current version.

4. *Server Configuration:* Your local server running at `127.0.0.1:4200` may have configuration changes or issues. Make sure that it is running and correctly configured.

If you can let me know your Prefect version (e.g., 2.x or 3.x), I can direct you to the relevant documentation or help troubleshoot the issue further!