# Failing to run cardano preview testnet... conway error

**URL:** <https://forum.cardano.org/t/failing-to-run-cardano-preview-testnet-conway-error/129342>\
**Category:** Misc Dev Talk\
**Created:** [21 March 2024 02:53 UTC](https://forum.cardano.org/t/failing-to-run-cardano-preview-testnet-conway-error/129342 "2024-03-21T02:53:31Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![TheDeen](https://avatars.discourse-cdn.com/v4/letter/t/51bf81/32.png) [@TheDeen](https://forum.cardano.org/u/TheDeen)\
**Post date:** [21 March 2024 02:53 UTC](https://forum.cardano.org/t/failing-to-run-cardano-preview-testnet-conway-error/129342/1 "2024-03-21T02:53:31Z")

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So I am trying to run the node on preview

Here is what I did:

cd preview

I ran the following:

![image](https://us1.discourse-cdn.com/flex023/uploads/cardano/original/3X/e/2/e2a77f065863c159e78b4b952e9e5cbe32eaece1.png)

Then the following:

cardano-node run --topology topology.json   
–database-path db   
–socket-path node.socket   
–port 3001   
–config config.json

I receive this error:

Conway related : There was an error parsing the genesis file: “./conway-genesis.json” Error: “Error in $.poolVotingThresholds: parsing Cardano.Ledger.Conway.Core.PoolVotingThresholds(PoolVotingThresholds) failed, key "pvtMotionNoConfidence" not found”

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**Author:** ![TheDeen](https://avatars.discourse-cdn.com/v4/letter/t/51bf81/32.png) [@TheDeen](https://forum.cardano.org/u/TheDeen)\
**Post date:** [21 March 2024 03:39 UTC](https://forum.cardano.org/t/failing-to-run-cardano-preview-testnet-conway-error/129342/2 "2024-03-21T03:39:52Z")

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If these are the updated configuration files, why would I be getting this error?

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**Author:** ![rdlrt](https://sea1.discourse-cdn.com/flex023/user_avatar/forum.cardano.org/rdlrt/32/9098_2.png) [@rdlrt](https://forum.cardano.org/u/rdlrt)\
**Post date:** [21 March 2024 07:00 UTC](https://forum.cardano.org/t/failing-to-run-cardano-preview-testnet-conway-error/129342/3 "2024-03-21T07:00:06Z")

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You need to update your node to 8.9.0 as well

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**Author:** ![Alexd1985](https://sea1.discourse-cdn.com/flex023/user_avatar/forum.cardano.org/alexd1985/32/23759_2.png) [@Alexd1985](https://forum.cardano.org/u/Alexd1985)\
**Post date:** [21 March 2024 08:46 UTC](https://forum.cardano.org/t/failing-to-run-cardano-preview-testnet-conway-error/129342/4 "2024-03-21T08:46:05Z")

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check which version do you run, navigate to bellow page and click on configuration files → preview testnet and download the file

> **[Releases · IntersectMBO/cardano-node](https://github.com/IntersectMBO/cardano-node/releases)**
>
> The core component that is used to participate in a Cardano decentralised blockchain. - IntersectMBO/cardano-node