# Yarn sign is throwing Error: call revert exception

**URL:** <https://forum.openzeppelin.com/t/yarn-sign-is-throwing-error-call-revert-exception/32426>\
**Category:** Defender\
**Created:** [October 13, 2022, 6:37am UTC](https://forum.openzeppelin.com/t/yarn-sign-is-throwing-error-call-revert-exception/32426 "2022-10-13T06:37:56Z")\
**Posts on this page:** 1\
**Showing post:** 9

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**Author:** ![jmsofarelli](https://avatars.discourse-cdn.com/v4/letter/j/82dd89/32.png) [@jmsofarelli](https://forum.openzeppelin.com/u/jmsofarelli)\
**Post date:** [November 10, 2022, 7:07pm UTC](https://forum.openzeppelin.com/t/yarn-sign-is-throwing-error-call-revert-exception/32426/9 "2022-11-10T19:07:02Z")

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@ernestognw I don't have the text anymore, because I did not save locally ☹

Yes, the error was the same.  
The Alchemy URL was set in `hardhat.config.js`

What I basically did was:

1. created a hardhat project from scratch,
2. created a custom MinimalForwarder contract with another name (to not interfere with OZ's one),
3. deployed contract using a regular wallet (not Relayer one).
4. copied the code from the workshop (except the deployment-related)
5. followed instructions of guide (except the deployment part)
6. fixed something in app ([https://github.com/OpenZeppelin/workshops/pull/25](https://github.com/OpenZeppelin/workshops/pull/25))
7. created /tmp dir

Everything is working now

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