# HRA model ValueError: The following stressor-habitat pair(s) do not have at least one exposure rating

**URL:** <https://community.naturalcapitalalliance.org/t/hra-model-valueerror-the-following-stressor-habitat-pair-s-do-not-have-at-least-one-exposure-rating/1745>\
**Category:** Software Support\
**Tags:** hra\
**Created:** [March 6, 2021, 3:36am UTC](https://community.naturalcapitalalliance.org/t/hra-model-valueerror-the-following-stressor-habitat-pair-s-do-not-have-at-least-one-exposure-rating/1745 "2021-03-06T03:36:36Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![esoth](https://avatars.discourse-cdn.com/v4/letter/e/9d8465/32.png) [@esoth](https://community.naturalcapitalalliance.org/u/esoth)\
**Post date:** [March 10, 2021, 7:24pm UTC](https://community.naturalcapitalalliance.org/t/hra-model-valueerror-the-following-stressor-habitat-pair-s-do-not-have-at-least-one-exposure-rating/1745/2 "2021-03-10T19:24:05Z")

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Closing, duplicate of [HRA model , TypeError: 'NoneType' object is not subscriptable - #5 by Giggle](https://community.naturalcapitalalliance.org/t/hra-model-typeerror-nonetype-object-is-not-subscriptable/1607/5).

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