Lec 8: Transaction reverted: function selector was not recognized and there's no fallback function

[ippy1997]

I am getting this error running my fund function in the front end using Metamask , hardhat local node

error

eth_call
  Contract call:       FundMe#<unrecognized-selector>
  From:                0xf39fd6e51aad88f6f4ce6ab8827279cfffb92266
  To:                  0xe7f1725e7734ce288f8367e1bb143e90bb3f0512

  Error: Transaction reverted: function selector was not recognized and there's no fallback function
      at FundMe.<unrecognized-selector> (contracts/FundMe.sol:24)
      at HardhatNode.runCall (/home//hh-fundME-scratch/node_modules/hardhat/src/internal/hardhat-network/provider/node.ts:616:20)
      at EthModule._callAction (/home//hh-fundME-scratch/node_modules/hardhat/src/internal/hardhat-network/provider/modules/eth.ts:354:9)
      at HardhatNetworkProvider._sendWithLogging (/home//hh-fundME-scratch/node_modules/hardhat/src/internal/hardhat-network/provider/provider.ts:139:22)
      at HardhatNetworkProvider.request (/home//hh-fundME-scratch/node_modules/hardhat/src/internal/hardhat-network/provider/provider.ts:116:18)
      at JsonRpcHandler._handleRequest (/home//hh-fundME-scratch/node_modules/hardhat/src/internal/hardhat-network/jsonrpc/handler.ts:188:20)
      at JsonRpcHandler._handleSingleRequest (/home//hh-fundME-scratch/node_modules/hardhat/src/internal/hardhat-network/jsonrpc/handler.ts:167:17)
      at Server.JsonRpcHandler.handleHttp (/home//hh-fundME-scratch/node_modules/hardhat/src/internal/hardhat-network/jsonrpc/handler.ts:52:21)

index.js

import { ethers } from "./ethers-5.6.esm.min.js"
import { abi, contractAddress } from "./constants.js"

const connectButton = document.getElementById("connect-btn")
const fundButton = document.getElementById("fund-btn")
connectButton.onclick = connect
fundButton.onclick = fund

async function connect() {
    
    if (typeof window.ethereum !== "undefined") {
        try {
            await window.ethereum.request({ method: "eth_requestAccounts" })
        } catch (error) {
            console.log(error)
        }
        connectButton.innerHTML = "connected"
    } else {
        connectButton.innerHTML = "Please install metamask"
    }
}

async function fund() {
    const ethAmount = "1"
    if (typeof window.ethereum !== "undefined") {
        console.log(`Funding with ${ethAmount}`)

       

        // 1-getting the provider
        const provider = new ethers.providers.Web3Provider(window.ethereum)

        // 2- getting singer/wallet
       
        const signer = provider.getSigner()
        console.log(signer)

        // 3- getting the contract : ABI & ADDRESS
        const contract = new ethers.Contract(contractAddress, abi, signer)
        const transactionResponse = await contract.fund({
            value: ethers.utils.parseEther(ethAmount),
        })
    }
}

[othaime-en]

Hey @ippy1997 checkout this similar discussion #315

[ippy1997]

the issue in that disccussion is a bit diffrent than mine , my tx got reverted due to the function selector not being available or no fallback function , even tho im calling the fund function

[othaime-en]

Try and add this fallback function in your fundMe.sol file

 fallback() external payable {
        fund();
    }

[ippy1997]

putting this code in my solidity Fixed the issue

fallback() external payable {
        if (msg.value > 100) {
            fund();
        }
    }

then i compiled the contract again , cleared my metamask account from the settings , and ran the node again
it worked

[othaime-en]

Oh good to hear it worked. Good luck

[tombullock]

I ran into the same issue and this appears to have resolved it. Thank you!