# Error uploading operational data

**URL:** <https://forum.langchain.com/t/error-uploading-operational-data/2597>\
**Category:** LangSmith Product Help\
**Created:** [December 24, 2025, 1:25pm UTC](https://forum.langchain.com/t/error-uploading-operational-data/2597 "2025-12-24T13:25:37Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![leon](https://avatars.discourse-cdn.com/v4/letter/l/dc4da7/32.png) [@leon](https://forum.langchain.com/u/leon)\
**Post date:** [December 24, 2025, 1:25pm UTC](https://forum.langchain.com/t/error-uploading-operational-data/2597/1 "2025-12-24T13:25:38Z")

</div>

The studio connected to the agent service I started locally, and when executing a dataset query, the following error was received:

[warning] Failed to send compressed multipart ingest: langsmith.utils.LangSmithError: Failed to POST [https://api.smith.langchain.com/runs/multipart](https://api.smith.langchain.com/runs/multipart) in LangSmith API. HTTPError(‘422 Client Error: unknown for url: [https://api.smith.langchain.com/runs/multipart](https://api.smith.langchain.com/runs/multipart)’, ‘{“error”:“Unprocessable entity: error reading multipart data: multipart: NextPart: failed to decompress: Unknown frame descriptor”}n’) [langsmith.client] api\_variant=local\_dev langgraph\_api\_version=0.5.39 thread\_name=ThreadPoolExecutor-0\_2

**This error has occurred many times recently when running, and I hope you can help me solve this problem.**