I get this error when I try to open a page in the DApp I'm developing.

Error: Cannot find module 'fs-promise'
Require stack:
- /Users/Desktop/RecycleChain/node_modules/swarm-js/lib/api-node.js
- /Users/Desktop/RecycleChain/node_modules/web3-bzz/lib/index.js
- /Users/Desktop/RecycleChain/node_modules/web3/src/index.js
- /Users/Desktop/RecycleChain/.next/dist/ethereum/web3.js
- /Users/Desktop/RecycleChain/.next/dist/pages/registration.js
- /Users/Desktop/RecycleChain/node_modules/next/dist/server/require.js
- /Users/Desktop/RecycleChain/node_modules/next/dist/server/render.js
- /Users/Desktop/RecycleChain/node_modules/next/dist/server/index.js
- /UsersDesktop/RecycleChain/node_modules/next/dist/bin/next-dev
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:965:15)
    at Function.Module._load (internal/modules/cjs/loader.js:841:27)
    at Module.require (internal/modules/cjs/loader.js:1025:19)
    at require (internal/modules/cjs/helpers.js:72:18)
    at Object.<anonymous> (/Users/Desktop/RecycleChain/node_modules/swarm-js/lib/api-node.js:1:11)
    at Module._compile (internal/modules/cjs/loader.js:1137:30)
    at Module._compile (/Users/Desktop/RecycleChain/node_modules/source-map-support/source-map-support.js:492:25)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1157:10)
    at Module.load (internal/modules/cjs/loader.js:985:32)
    at Function.Module._load (internal/modules/cjs/loader.js:878:14) 

This error only occurs when I use an import a smart contract instance from register.js (in ethereum folder) file to registration.js (in pages folder). I use this following import statement

import registerContract from '../ethereum/register'; // import SC instance

My File system looks like this


The content of register.js is this

import web3 from './web3'; 
import register from './build/Register.json'; 

const instance = new web3.eth.Contract(
     // Address of the regist.sol contract in ropsten network

export default instance; 

The versions of fs-extra that I'm using is "fs-extra": "^9.0.1",.

Update: The error seems to disappear when I press enter between the lines of web3.js file but then it comes back again when I refresh the page.

this is web3.js:

import Web3 from 'web3'; 

//current provider is the provider injected by MetaMask 
let web3;

//typeof is used to check if window is defined 
if (typeof window !== 'undefined' && typeof window.web3 !== 'undefined') {
  // We are in the browser and metamask is running.
  //Connect metamask to the webapp 
  web3 = new Web3(window.web3.currentProvider);
} else {
  // We are on the server *OR* the user is not running metamask
  const provider = new Web3.providers.HttpProvider( 'https://ropsten.infura.io/v3/a5dc022ed8df4754b509e1f289d10b05');
  web3 = new Web3(provider);

export default web3;

1 Answer 1


I also got the same error. However, I updated the Node version(v14.17.0) and it's not throwing 'fs-promise' error.

So please update your Node version.

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