@Marvin i am trying to submit a task that calls an internal grpc client. I pass an authentication token to the method that calls the client. i am getting this error on the task run: Crash detected! Execution was interrupted by an unexpected exception: TypeError: cannot pickle ‘_thread.RLock’ object. How do i fix this?

It seems there were no direct hits in the Prefect documentation or GitHub issues for the specific error message you're encountering. However, the error message

TypeError: cannot pickle '_thread.RLock' object

suggests there's an issue with pickling objects when running a task. This is typically related to an object that isn't serializable being used within the task, such as an RLock object which is inherently not serializable. The solution in the context of Prefect may involve ensuring that you're not attempting to serialize any non-serializable objects within your task, particularly if this applies to objects associated with gRPC clients. Here are a few things you might try: 1. Make sure the gRPC client is instantiated within the task run, not at the flow module level, to avoid serialization of the client itself. 2. Look for any global variables that might be causing serialization issues. 3. Ensure that any object that goes in or out of a Prefect task can be pickled, which typically means it should not contain non-serializable objects like threads or locks. If this information isn't sufficient, I would recommend creating a new issue on the Prefect GitHub repository with a detailed description of your problem, any relevant code snippets, and the full traceback of the error you're encountering. This will help the Prefect community and maintainers provide you with a more accurate solution. If you need further assistance or specific guidance on code changes, feel free to provide your task and relevant function code, and I can suggest more direct actions.