# Hellinger Tool: "Calculate uncertainties" fails with Python error "Unknown error" (Calculate pole works)

**URL:** https://discourse.gplates.org/t/hellinger-tool-calculate-uncertainties-fails-with-python-error-unknown-error-calculate-pole-works/3199
**Category:** Q&A
**Created:** [21 January 2026 07:25 UTC](https://discourse.gplates.org/t/hellinger-tool-calculate-uncertainties-fails-with-python-error-unknown-error-calculate-pole-works/3199 "2026-01-21T07:25:03Z")
**Posts on this page:** 1
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### Author: ![john.cannon](https://discourse.gplates.org/letter_avatar_proxy/v4/letter/j/3e96dc/32.png) [@john.cannon](https://discourse.gplates.org/u/john.cannon)
#### Post date: [8 February 2026 23:20 UTC](https://discourse.gplates.org/t/hellinger-tool-calculate-uncertainties-fails-with-python-error-unknown-error-calculate-pole-works/3199/2 "2026-02-08T23:20:34Z")

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Hi Shin,

Thanks for reporting that, and apologies for the delay replying.

It might be a Python 2 vs 3 issue similar to [here](https://discourse.gplates.org/t/use-of-hellinger-tool-when-the-conjugate-plate-is-gone/239/4) but in a different area.

Yes, if you can send a minimal sample dataset that reproduces the issue then I’ll take a look (you can click on my name and`Message` me directly).

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_[View the full topic](https://discourse.gplates.org/t/hellinger-tool-calculate-uncertainties-fails-with-python-error-unknown-error-calculate-pole-works/3199)._