# Converted Cylc 8 Suite Incompatible

**URL:** <https://cms-helpdesk.ncas.ac.uk/t/converted-cylc-8-suite-incompatible/1776>\
**Category:** Rose/Cylc and FCM\
**Tags:** ARCHER2\
**Created:** [15 August 2025 10:58 UTC](https://cms-helpdesk.ncas.ac.uk/t/converted-cylc-8-suite-incompatible/1776 "2025-08-15T10:58:39Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![RosalynHatcher](https://dub1.discourse-cdn.com/flex013/user_avatar/cms-helpdesk.ncas.ac.uk/rosalynhatcher/32/11_2.png) [@RosalynHatcher](https://cms-helpdesk.ncas.ac.uk/u/RosalynHatcher)\
**Post date:** [15 August 2025 11:39 UTC](https://cms-helpdesk.ncas.ac.uk/t/converted-cylc-8-suite-incompatible/1776/2 "2025-08-15T11:39:15Z")

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Hi Alfred,

It’s because you’ve previously been running the suite with cylc7 and the cylc7 database is not compatible with the cylc8.

I’m currently looking at your postprocessing issue in ticket [Validity Time Mismatch](https://cms-helpdesk.ncas.ac.uk/t/validity-time-mismatch/1773) For the moment please DO NOT delete your cylc-run directories for u-dr920 as I need the files under there to try and diagnose the issue.

Regards,  
Ros.

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