Error "no caller for this invocation" in Python Workflow Example: What's the Cause?

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Hi,I always get a err about “no caller for this invocation” , what’s err about the python workflow. The code is from the example.

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Hi , The error is because you have configure your HTTP trigger to response a custom response (1st image below), but you have not execute the code to response data in your steps.

To remove this error, you can simply update your HTTP trigger > HTTP Response prop to another option

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I need use the python to response data.How can I do thay?The log show I response data correct but client show that err.I try python and node,they all same err.

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maybe you can see this workflow？https://pipedream.com/@midjourney/untitled-workflow-p_2gCeb1a/

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you can follow this doc to response custom data in HTTP trigger using python: Python

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It’s work now. Thank you so much.