Yarn sign is throwing Error: call revert exception

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

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)
  7. created /tmp dir

Everything is working now