Lesson 8 - Unrecognized selector

[alkali333]

I got to the point where we first try the fund function on the local blockchain. The transaction goes through in metamask, but when I look at my hardhat node, I see this

Contract call:       FundMe#<unrecognized-selector>   
From:                0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266   
To:                  0xe7f1725e7734ce288f8367e1bb143e90bb3f0512  
Error: Transaction reverted: function selector was not recognized and there's no fallback function

[alymurtazamemon]

@alkali333 Make sure the abi you imported to the frontend is correct, you can copy that from the contracts files (artifacts/contracts/ContractsFolder/contract.json). Copy the ABI array (start from [ till closing ]) and paste it into the fronted file.

And make to restart the metamask and rerun the hardhat node.

[alkali333]

The abi is there, I took it from the previous lessons code and all the tests were working.

I've restarted metamask and the node, but I still get the error.

I copy/pasted Patrick's fund function from the repo just in case I had made some kind of syntax error - but still the same issue.

A Google search showed people having the same issue and it seems to be with hardhat

MetaMask/metamask-extension#14963

[othaime-en]

Hey @alkali333 checkout this similar discussion and see it helps solve your issue.

[alkali333]

@othaime-en - thanks! I can get it to call the fallback function (which in turn calls my fund function) but I am still seeing FundMe#unrecognized-selector

@alymurtazamemon - it does seem like an ABI problem, but If that was the case, would I not get an error when grabbing the contract with ethers.Contract? My ABI is copy/pasted from the artifacts folder in hardhat and seems to be ok

[alymurtazamemon]

@alkali333 See this LINK

[alkali333]

I have got it to work on the Goerli testnet. I was able to fund the contract using the frontend and everything was fine.

https://goerli.etherscan.io/address/0xEfE076700D3FE80aa041671cd01987e914CEc34D

So it seems there is a problem with hardhat?

[othaime-en]

Oh yeah. The problem was on hardhat. I encountered the same a while ago. But if it worked well on Goerli, there is nothing wrong with your fund function.
Glad it worked out for you.
All the best!

[alkali333]

@othaime-en thanks for your encouragement! I'd still like to get hardhat working properly because it seems great for testing (especially with the deploy plugin). But I will proceed with the course for now.. So much to learn!