Handling Custom Error

External question — Ethereum Stack Exchange Author: AAIIWITF Original post: https://ethereum.stackexchange.com/questions/134462 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. Why it doesn't work when I use... $ yarn hardhat --verison 2.10.2 await expect(fundMeConnectedContract.withdraw() ).to.be.revertedWith( "FundMe__NotOwner" ) but this worked await expect(fundMeConnectedContract.withdraw() ).to.be.revertedWithCustomError( fundMeConnectedContract, "FundMe__NotOwner" ) Has the hardhat custom error handling changed since May this year..??

External answer — Ethereum Stack Exchange Author: sola24 Original post: https://ethereum.stackexchange.com/a/134466 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. the former is matching against the revert message. e.g. .to.be.revertedWith("go away") would work with this code require(msg.sender == owner,"go away"); the latter is just matching against the custom error

External answer — Ethereum Stack Exchange Author: Alphard1188118 Original post: https://ethereum.stackexchange.com/a/137823 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. await expect(fundMeConnectedContract.withdraw()).to.be.revertedWithCustomError(fundMe, "FundMe__NotOwner") Hey , buddy if you follow exactly the tutorial. try revertedWithCustomError and add fundMe, "FundMe__NotOwner" . Line explanation : fundMe will be your deployed contract FundMe__NotOwner the custom error from fundMe.sol Do also check if you using single or double underscore for FundMe__NotOwner in fundMe.sol I hope this would help if you still not found out the solution

External answer — Ethereum Stack Exchange Author: Francis G MBT Original post: https://ethereum.stackexchange.com/a/142050 License: CC BY-SA 4.0 — https://creativecommons.org/licenses/by-sa/4.0/ Adaptation: HTML converted to plain text; contact email addresses removed. I hope you got an Answer already, if not just try to delete the custom error passed to revertedWithCustomError and write it down yourself. I copie-pasted it and it could not recognise as defined custom-Error in the contract.