# Carbon Model Error encountered running results

**URL:** <https://community.naturalcapitalalliance.org/t/carbon-model-error-encountered-running-results/1549>\
**Category:** Software Support\
**Tags:** carbon\
**Created:** [December 1, 2020, 7:50am UTC](https://community.naturalcapitalalliance.org/t/carbon-model-error-encountered-running-results/1549 "2020-12-01T07:50:40Z")\
**Posts on this page:** 1\
**Showing post:** 11

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**Author:** ![swolny](https://yyz1.discourse-cdn.com/flex031/user_avatar/community.naturalcapitalalliance.org/swolny/32/181_2.png) [@swolny](https://community.naturalcapitalalliance.org/u/swolny)\
**Post date:** [December 10, 2020, 4:58pm UTC](https://community.naturalcapitalalliance.org/t/carbon-model-error-encountered-running-results/1549/11 "2020-12-10T16:58:39Z")

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Hi @shahzad -

Have you searched the forum for existing posts on this error? [Here’s one to check out](https://community.naturalcapitalalliance.org/t/carbon-keyerror-c-above/740) - see if any of the recommendations help you.

Also, I see that you are using InVEST 3.5, which is rather old. We generally recommend using the [latest version](https://naturalcapitalproject.stanford.edu/software/invest), which has a lot of bug fixes and improvements.

~ Stacie

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