# Confidence Threshold for feature-classifier classify-sklearn

**URL:** https://forum.qiime2.org/t/confidence-threshold-for-feature-classifier-classify-sklearn/18881
**Category:** User Support
**Tags:** taxonomy
**Created:** [March 16, 2021, 8:12pm UTC](https://forum.qiime2.org/t/confidence-threshold-for-feature-classifier-classify-sklearn/18881 "2021-03-16T20:12:04Z")
**Posts on this page:** 1
**Showing post:** 8

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### Author: ![ChrisKeefe](https://forum.qiime2.org/user_avatar/forum.qiime2.org/chriskeefe/32/1907_2.png) [@ChrisKeefe](https://forum.qiime2.org/u/ChrisKeefe)
#### Post date: [March 26, 2021, 9:50pm UTC](https://forum.qiime2.org/t/confidence-threshold-for-feature-classifier-classify-sklearn/18881/8 "2021-03-26T21:50:08Z")

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> [@amin](#):
>
> IndexError: pop from empty list

Thanks for your patience, @amin. I've been under the weather. Often the fastest way to troubleshoot errors like this is to search 🔍 this forum for the error message. I found a bunch of results, including [this one](https://forum.qiime2.org/t/plugin-error-from-feature-classifier-pop-from-empty-list/1431/13), by searching "IndexError: pop from empty list".

Give that post a read - I suspect you'll need to fix your taxonomy, but that should steer you in the right direction.

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