@Marvin, No class found for dispatch key \'s3-bucket\' in registry for type \'WritableFileSystem\'

It looks like you are encountering an error related to Prefect's WritableFileSystem functionality, potentially when trying to write to an S3 bucket. To help you more effectively, I need to know which version of Prefect you are using, as the implementation and support for S3 in Prefect may vary between versions. Could you please confirm whether you are using Prefect 2.x or Prefect 3.x? If you are unsure, you can often check this by running

pip show prefect

in your terminal or checking your

requirements.txt

or

poetry.lock

files.

prefect 3@Marvin

In Prefect 3, it seems that you're facing an issue with the S3 bucket integration, particularly regarding the WritableFileSystem when dealing with S3. Here's what I gathered from both the documentation and similar issues that might help you resolve this problem: 1. Prefect AWS Plugin: Ensure that the Prefect AWS plugin is installed and up-to-date. You can install it using:

pip install -U prefect-aws

2. AWS Credentials: You need to have your AWS credentials properly set up. Prefect uses

AWSCredentials

to interact with S3. An example from the Prefect 3 documentation shows how to configure the S3 bucket with AWS credentials:

python
   from prefect_aws import AWSCredentials, S3Bucket

   my_s3_bucket = S3Bucket(
       bucket_name="my_s3_bucket",
       credentials=AWSCredentials.load("my_aws_credentials")
   )
   my_s3_bucket.save("my_s3_bucket")

3. GitHub Issues: There are related issues, such as one with custom blocks not being found after upgrading to newer versions. This might be due to recent changes in how Prefect handles custom blocks or registration. More details can be found in this GitHub issue. 4. Usage Error: If you see "No class found for dispatch key 's3-bucket'", it might be related to how the S3Bucket class is being imported or used. Ensure you use Prefect 3 structures, specifically aligning your code with documentation examples like above for interacting with S3. 5. Documentation Reference: More detailed instructions on deploying and storing flow code with S3 in Prefect 3 can be found here. If you follow these suggestions and continue facing issues, it might be helpful to ensure that all dependencies are correctly set up and, if still in doubt, consult further Prefect community resources or forums for user-specific scenarios.