Hi Prefect Community I am currently receiving an error when

Question

Hi Prefect Community I am currently receiving an error when using a local on my pc prefect agent which pulls from a work queue in the the prefect cloud The error only occurs when I try to use the RayTaskRunner ``` begin task run pid=141324 ImportError cannot import name SubprocessFlowRunner from partially initialized module prefect flow runners most likely due to a circular import home christian Documents ray and prefect env lib python3 9 site packages prefect flow runners init py ``` I am using the following dependencies prefect==2 0b7 prefect ray==0 1 0 ray==1 13 0 Apparently I am doing something wrong with my dependencies or when I am importing them Do you have any idea

Christian Vogel · Answer

This is my flow and deployment ```from prefect import task flow from prefect ray import RayTaskRunner from prefect deployments import DeploymentSpec task def say hello name print f hello name flow name= temp flow example task runner=RayTaskRunner address= auto def greetings say hello Ford DeploymentSpec name= temp flow example flow=greetings ```

Christian Vogel · Answer

What confuses me a bit is the fact that the flow only fails when pulled from the cloud and seems to work when i run it directly locally via python and a main method

Christian Vogel · Answer

Could it be related to the fact that I am running my agent in a virtual environment Probably in the background the following is executed ```from prefect flow runners import SubprocessFlowRunner``` which them leads to some import issues because of the already imported ```from prefect ray import RayTaskRunner``` Is that possible

Anna Geller · Answer

do you run your agent in the same virtual environment as you run your local process perhaps you can explicitly define your flow runner with the virtual environment you use for your agent ```flow runner=SubprocessFlowRunner condaenv= yourcondavenv ```

Anna Geller · Answer

I was trying to replicate and sth also didn t work for me even though I got a different error message using the same versions as you did

Anna Geller · Answer

my error was ```Failed to read dashboard log Errno 2 No such file or directory tmp ray session 2022 07 07 14 08 35 008202 6668 logs dashboard log ```

Anna Geller · Answer

wow it took me forever to set this up but this helped <https docs ray io en master ray overview installation html m1 mac apple silicon support> looks like you need to be super careful about your environment with Ray and grpcio package do you use Conda on which machine do you run it

Christian Vogel · Answer

Tried specifying the SubprocessFlowRunner with the virtual env path in my case but did not help

Christian Vogel · Answer

I am running a venv on a linux ubuntu machine

Anna Geller · Answer

yup you re right I was able to reproduce your error thanks for reporting that < Marvin> open Flow run with Ray and agent throws `ImportError cannot import name SubprocessFlowRunner from partially initialized module prefect flow runners `

Marvin · Answer

Christian Vogel · Answer

thanks for the quick support as always