# Error in buffin errorCode

**URL:** <https://cms-helpdesk.ncas.ac.uk/t/error-in-buffin-errorcode/1945>\
**Category:** Unified Model\
**Tags:** Monsoon2\
**Created:** [27 December 2025 15:41 UTC](https://cms-helpdesk.ncas.ac.uk/t/error-in-buffin-errorcode/1945 "2025-12-27T15:41:07Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![MYoshioka](https://avatars.discourse-cdn.com/v4/letter/m/c5a1d2/32.png) [@MYoshioka](https://cms-helpdesk.ncas.ac.uk/u/MYoshioka)\
**Post date:** [15 January 2026 11:19 UTC](https://cms-helpdesk.ncas.ac.uk/t/error-in-buffin-errorcode/1945/2 "2026-01-15T11:19:21Z")

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This problem has gone after the other problem was fixed. I haven’t figured out any detail of this but they must be related.

> [@BiCGstab error at the beginning of simulation](https://cms-helpdesk.ncas.ac.uk/t/bicgstab-error-at-the-beginning-of-simulation/1934):
>
> #Monsoon3 My UM vn13.9 UKESM1.1 global AMIP suite, u-dv077, completed a one-year simulation without a problem (finally). Now I copied it and created u-dv258. I removed the aviation emissions that I added to ukca\_em\_file in u-dv077 and tried to run the suite. It failed with this error; NaNs in error term in BiCGstab after 1 iterations I’m aware that this problem is usually treated by perturbing the dump file created in the last cycle. However, in this case this occurs at the beginning of the ru…

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