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Hello, I’m having this error, all the solutions seems outdated
```TypeError: cannot pickle '_thread.lock' object```

Can you share more info about your flow structure? Do you use any database connections or HTTP clients? Those cannot be serialized and sent between Dask workers. If you don’t use Dask, you may look at <https://docs.prefect.io/orchestration/flow_config/storage.html#pickle-vs-script-based-storage|Script-based storage>. Kevin explained it <https://prefect-community.slack.com/archives/CL09KU1K7/p1631606496203600|here>.

Hey <@U02GJ5EJKT9>, this is likely from a task having an output that can’t be serialized as Anna mentioned

Thanks <@U02H1A95XDW> for your response, yes, i use http clients to fetch data from an API

<@U01QEJ9PP53> I’m fetching data from an API and writing it to the s3 bucket

Did you manage to solve it? If you move the boto3 client to the task in which you interact with S3, this should solve the serialization issue.

Thanks <@U02H1A95XDW>, I have been able to solve the issue