I just upgraded my venvs to 2.4.1 and I'm getting the following when I run any prefect command I've tested (--help, profile etc). Am I the only one with this issue? Might not be a Prefect problem, could be something in my venvs. Note that everything still appears to work, other than the annoying error messages. Edit: I moved the error message to later in the thread

Which python version are you using and can you replicate the behaviour with a fresh venv created from scratch?

3.8.9, it is a fresh venv created from scratch. 🙂

I’m not able to reproduce this with Python 3.10.6 or Python 3.8.14. edit: I’m on arm chip mac running latest macos.

Okay! Interesting. Unfortunately we can't easily upgrade due to another dependency currently but we should be able to within a couple of weeks. I will give it a go then. Everything seems to work fine other than the messages anyway. Thank you.

i'm experiencing the same issue with prefect 2.4.1 and python 3.8.10

I'm having the same problem in both Windows and Ubuntu WSL. Python 3.10.6 and Prefect==2.4.1

Oh, I'm also on Ubuntu 20.04 and wsl

Same here with Python 3.8 and Prefect==2.4.1 (Linux)

Thank you for the reports. 🙂 Are you able to move the error message to the thread please, Oscar? Interesting, I’m not seeing issues in a Conda environment on M1 Mac Python 3.10, Prefect 2.4.1. Sounds like a bug. Are you able to open an issue Oscar or anyone else seeing? Please note the virtual environment manager - maybe this is a venv issue.

Error message:

(all) oz@computer:~/git/analytics$ prefect --help
Failed to parse annotation from 'Name' node: 'NoneType' object has no attribute 'resolve'
Failed to parse annotation from 'Name' node: 'NoneType' object has no attribute 'resolve'
etc...
Failed to parse annotation from 'Subscript' node: 'NoneType' object has no attribute 'resolve'
Failed to parse annotation from 'Name' node: 'NoneType' object has no attribute 'resolve'
Failed to parse annotation from 'Name' node: 'NoneType' object has no attribute 'resolve'
Failed to parse annotation from 'Subscript' node: 'NoneType' object has no attribute 'resolve'
Failed to parse annotation from 'Name' node: 'NoneType' object has no attribute 'resolve'
Failed to parse annotation from 'Name' node: 'NoneType' object has no attribute 'resolve'
Failed to parse annotation from 'Subscript' node: 'NoneType' object has no attribute 'resolve'

Usage: prefect [OPTIONS] COMMAND [ARGS]...
Rest of printout omitted

After upgrading from 2.4.0 to 2.4.1 I’m seeing some of my unit tests failing with:

@inject_client
    async def create_then_begin_flow_run(
        flow: Flow,
        parameters: Dict[str, Any],
        return_type: EngineReturnType,
        client: OrionClient,
    ) -> Any:
        """
        Async entrypoint for flow calls
    
        Creates the flow run in the backend, then enters the main flow run engine.
        """
        # TODO: Returns a `State` depending on `return_type` and we can add an overload to
        #       the function signature to clarify this eventually.
    
>       connect_error = await client.api_healthcheck()
E       AttributeError: 'NoneType' object has no attribute 'api_healthcheck'

Hi Josh. Thank you for raising. This looks like a different issue. Are you able to open a bug report in GitHub with the issue?

sure thing

Same thing after upgrading to 2.4.1, ubuntu 20.04, python 3.9.8, both w and w/o venv

Awesome! 🎉

Same, the Prefect CLI works, but spits out a all those

Failed to parse

lines above

>prefect version
Failed to parse annotation from 'Name' node: 'NoneType' object has no attribute 'resolve'
Failed to parse annotation from 'Name' node: 'NoneType' object has no attribute 'resolve'
Failed to parse annotation from 'Name' node: 'NoneType' object has no attribute 'resolve'
Failed to parse annotation from 'Name' node: 'NoneType' object has no attribute 'resolve'
Failed to parse annotation from 'Name' node: 'NoneType' object has no attribute 'resolve'
Failed to parse annotation from 'Name' node: 'NoneType' object has no attribute 'resolve'
Failed to parse annotation from 'Name' node: 'NoneType' object has no attribute 'resolve'
Failed to parse annotation from 'Name' node: 'NoneType' object has no attribute 'resolve'
Failed to parse annotation from 'Name' node: 'NoneType' object has no attribute 'resolve'
Failed to parse annotation from 'Name' node: 'NoneType' object has no attribute 'resolve'
Failed to parse annotation from 'Name' node: 'NoneType' object has no attribute 'resolve'
Failed to parse annotation from 'Name' node: 'NoneType' object has no attribute 'resolve'
Failed to parse annotation from 'Name' node: 'NoneType' object has no attribute 'resolve'
Failed to parse annotation from 'Name' node: 'NoneType' object has no attribute 'resolve'
Failed to parse annotation from 'Subscript' node: 'NoneType' object has no attribute 'resolve'
Failed to parse annotation from 'Name' node: 'NoneType' object has no attribute 'resolve'
Failed to parse annotation from 'Name' node: 'NoneType' object has no attribute 'resolve'
Failed to parse annotation from 'Subscript' node: 'NoneType' object has no attribute 'resolve'
Failed to parse annotation from 'Name' node: 'NoneType' object has no attribute 'resolve'
Failed to parse annotation from 'Name' node: 'NoneType' object has no attribute 'resolve'
Failed to parse annotation from 'Subscript' node: 'NoneType' object has no attribute 'resolve'
Version:             2.4.2
API version:         0.8.0
Python version:      3.10.6
Git commit:          65807e84
Built:               Fri, Sep 23, 2022 10:43 AM
OS/Arch:             linux/x86_64
Profile:             default
Server type:         hosted

running the agent still works.. 🙂

There’s an issue to track the warnings here.

Sorry about that Jeff, I missed the issue somehow when looking to see if it had been reported. Thanks!

No problem, Oscar. It’s a relatively new issue - just wanted to share it so folks could track it.