# After more than a week running, now the producer node get this exception "Could not update KES key" and stops

**URL:** <https://forum.cardano.org/t/after-more-than-a-week-running-now-the-producer-node-get-this-exception-could-not-update-kes-key-and-stops/34850>\
**Category:** Operate a Stake Pool\
**Tags:** haskell, cardano-node\
**Created:** [24 June 2020 16:10 UTC](https://forum.cardano.org/t/after-more-than-a-week-running-now-the-producer-node-get-this-exception-could-not-update-kes-key-and-stops/34850 "2020-06-24T16:10:46Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![willcbanks](https://avatars.discourse-cdn.com/v4/letter/w/c57346/32.png) [@willcbanks](https://forum.cardano.org/u/willcbanks)\
**Post date:** [10 July 2020 11:18 UTC](https://forum.cardano.org/t/after-more-than-a-week-running-now-the-producer-node-get-this-exception-could-not-update-kes-key-and-stops/34850/6 "2020-07-10T11:18:22Z")

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thanks. I actually solved this here:

> [@Pool Management Frameworks](https://forum.cardano.org/t/pool-management-frameworks/33595/3):
>
> Hi I am trying to get some help with CNtools. Not sure if there is a better place to ask this? It seems to all be fine, I made a wallet, created the pool. The wallet has 60,000 ADA in it. Except when I try to register the pool, it won’t create the certificate. I get this output: – creating registration cert – cardano-cli: Ratio has zero denominator – creating delegation cert – – Sending transaction to chain – – Register Pool and Pledge on Chain – – Protocol Parameters – TN Magic is 42 …

I typed in the percent as 0.04 instead of just 4.  
that is a gotcha after building the certs manually.

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