@Marvin I am running into an error while using prefect-dask.

Traceback (most recent call last):

File "<string>", line 1, in <module>

File "/usr/local/lib/python3.10/site-packages/prefect_dask/__init__.py", line 2, in <module>

from .task_runners import DaskTaskRunner  # noqa

File "/usr/local/lib/python3.10/site-packages/prefect_dask/task_runners.py", line 89, in <module>

class DaskTaskRunner(BaseTaskRunner):

File "/usr/local/lib/python3.10/site-packages/prefect_dask/task_runners.py", line 256, in DaskTaskRunner

call: Callable[..., Awaitable[State[R]]],

TypeError: 'ModelMetaclass' object is not subscriptable

The error you're encountering with

prefect-dask

seems related to the usage of

pydantic

models and type annotations that are causing the

'ModelMetaclass' object is not subscriptable

error. This issue can arise due to changes or stricter type checks between different versions of libraries. ### Detailed Breakdown: 1. Possible Cause: The error is probably caused by the misuse of typing annotations or compatibility issues between

prefect-dask

and

pydantic

. 2. Prefect and Dask Integration: Both the Prefect 2.x and 3.x documentation refer to using the

DaskTaskRunner

for Dask integration. It seems both versions mention configurations involving Dask's adaptive scaling and other cluster configurations (source: link1, link2). ### Steps to Resolve: 1. Check Pydantic Version: Ensure you are using a compatible version of

pydantic

that aligns with your Prefect version. 2. Update Prefect & Dependencies: Make sure your prefect, prefect-dask, and pydantic libraries are up to date to avoid compatibility issues. 3. Example Fix: Adjust the

Callable

type annotations to be compatible. You might need to replace or modify

python
   call: Callable[..., Awaitable[State[R]]]

to a compatible format based on the library versions you are using. ### Links for Reference: - Prefect Dask 2.x Task Runners - Prefect Dask 3.x Task Runners If the above steps do not resolve your issue, consider providing more details such as your versions of Prefect, Prefect-Dask, and Pydantic for further assistance.