在运行使用solidity 智能合约的next.js 应用程序时，出现“无法读取未定义的属性”错误

Question

I was running my next.js app and trying to fetch user I am getting "cannot read properties of undefined" error

And following error in the console

Below is the code I was using

import Ewitter from './Ewitter.json';
import ethers from 'ethers';
import { useState, useEffect } from 'react';
const ContractABI = Ewitter.abi;
const ContractAddress = '0x5FbDB2315678afecb367f032d93F642f64180aa3';
const Ethereum = typeof window !== 'undefined' && (window as any).ethereum;

const getEwitterContract = () => {
  const provider = new ethers.providers.Web3Provider(Ethereum);
  const signer = provider.getSigner();
  const EwitterContract = new ethers.Contract(
    ContractAddress,
    ContractABI,
    signer
  );

  return EwitterContract;
};

const useEwitter = () => {
  // const Ewitter = getEwitterContract();

  const [currentAccount, setCurrentAccount] = useState<string>('');
  const [currentUser, setCurrentUser] = useState<string>('');

  const connect = async () => {
    try {
      if (!Ethereum) {
        alert('Please install MetaMask');
        return;
      }
      const accounts = await Ethereum.request({
        method: 'eth_requestAccounts',
      });
      if (accounts.length === 0) {
        alert('Please unlock MetaMask');
        return;
      }
      const account = accounts[0];
      console.log('connected to account: ', account);
        setCurrentAccount(account);
    } catch (errors) {
      console.log(errors);
    }
  };

  useEffect(() => {
    if(!Ethereum){
        console.log("No ethereum wallet found, please install metamask")
        return ;
    }
    connect();
  }, []);

  useEffect(() =>{
    if(currentAccount){
      getUser();
    }
  }, [currentAccount])

const getUser = async ()=>{
  const contract = getEwitterContract();
  const user = await contract.getUser(currentAccount);
  const {avatar, bio, name, username, wallet} = user;
  console.log(user);
  return user;
}

  return { connect, account: currentAccount };
};

export default useEwitter;

# Update1 I've changed import ethers from 'ethers' to import {ethers} from 'ethers' and now I'm facing this error

If unable to understand properly or if you want to see the whole codebase then this is the link to the github repo

https://github.com/ChiragDogra/ewitter/blob/userIssue/dapp/hooks/useEwitter.ts

Answer 1

believe or not I just had that issue.

the problem is how you are importing ethers . Should be

 import { ethers } from "ethers";