@Marvin I’m running a flow in parallel in with prefect-dask and I’m hitting this error when trying to access an attribute of a block:

AttributeError: 'coroutine' object has no attribute

. What’s the best way to handle this?

The error you're experiencing,

AttributeError: 'coroutine' object has no attribute

, often occurs when attempting to access an attribute or method on a coroutine object directly instead of using

await

to get its result. This error is common when dealing with asynchronous functions in Python, particularly with libraries like Prefect that support async functionality. When using Prefect with Dask and encountering this issue, it's important to ensure that any Prefect method returning a coroutine is awaited properly if it needs to be called directly. Here are steps to handle the issue: 1. Identify the Coroutine: Determine which function or call is returning a coroutine. In Prefect, this might be a call to an asynchronous method. 2. Await the Coroutine: If you have identified that the block operation is asynchronous (returns a coroutine), you should

await

it. For example:

python
   block_attribute = await some_block.method()

Make sure your environment supports async execution where this code is running. 3. Use Sync Alternatives: If the environment or use case doesn’t support async execution, check if there are synchronous alternatives or provide a way to run the coroutine in a synchronous context. This might be through Prefect settings or specific method arguments that enforce synchronous behavior. 4. Research Specific Issues: There have been various Prefect GitHub issues discussing similar errors: - Issue #15086 addresses an async error with Prefect blocks. - Issue #14712 mentions coroutine attribute errors post updates in Prefect. For further detailed Prefect version-specific guidance, consult the Prefect documentation: - Prefect 2.x Documentation - Prefect 3.x Documentation If you can provide the exact Prefect version you are using, I can direct you to more specific documentation links or solutions based on that.