I bootstrapped my application with create-react-app and when I run my app it compiles with warnings and it throws errors on the browser.

Error while compiling

./node_modules/rc-picker/node_modules/moment/src/lib/locale/locales.js
Module not found: Can't resolve './locale' in '/Users/macbook/Desktop/projects/pizza/Yummi-fend/node_modules/rc-picker/node_modules/moment/src/lib/locale'

Error on browser

Error: Cannot find module './locale'
▶ 2 stack frames were collapsed.
__webpack_require__
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:784
  781 | };
  782 | 
  783 | // Execute the module function
> 784 | modules[moduleId].call(module.exports, module, module.exports, hotCreateRequire(moduleId));
      | ^  785 | 
  786 | // Flag the module as loaded
  787 | module.l = true;
View compiled
fn
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:150
  147 |         );
  148 |         hotCurrentParents = [];
  149 |     }
> 150 |     return __webpack_require__(request);
      | ^  151 | };
  152 | var ObjectFactory = function ObjectFactory(name) {
  153 |     return {
View compiled
Module../node_modules/moment/src/lib/moment/moment.js
node_modules/moment/src/lib/moment/moment.js:1
__webpack_require__
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:784
  781 | };
  782 | 
  783 | // Execute the module function
> 784 | modules[moduleId].call(module.exports, module, module.exports, hotCreateRequire(moduleId));
      | ^  785 | 
  786 | // Flag the module as loaded
  787 | module.l = true;
View compiled
fn
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:150
  147 |         );
  148 |         hotCurrentParents = [];
  149 |     }
> 150 |     return __webpack_require__(request);
      | ^  151 | };
  152 | var ObjectFactory = function ObjectFactory(name) {
  153 |     return {
View compiled
Module../node_modules/moment/src/moment.js
node_modules/moment/src/moment.js:1
__webpack_require__
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:784
  781 | };
  782 | 
  783 | // Execute the module function
> 784 | modules[moduleId].call(module.exports, module, module.exports, hotCreateRequire(moduleId));
      | ^  785 | 
  786 | // Flag the module as loaded
  787 | module.l = true;
View compiled
fn
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:150
  147 |         );
  148 |         hotCurrentParents = [];
  149 |     }
> 150 |     return __webpack_require__(request);
      | ^  151 | };
  152 | var ObjectFactory = function ObjectFactory(name) {
  153 |     return {
View compiled
Module../node_modules/rc-picker/es/generate/moment.js
node_modules/rc-picker/es/generate/moment.js:1
__webpack_require__
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:784
  781 | };
  782 | 
  783 | // Execute the module function
> 784 | modules[moduleId].call(module.exports, module, module.exports, hotCreateRequire(moduleId));
      | ^  785 | 
  786 | // Flag the module as loaded
  787 | module.l = true;
View compiled
fn
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:150
  147 |         );
  148 |         hotCurrentParents = [];
  149 |     }
> 150 |     return __webpack_require__(request);
      | ^  151 | };
  152 | var ObjectFactory = function ObjectFactory(name) {
  153 |     return {
View compiled
Module../node_modules/antd/es/calendar/index.js
node_modules/antd/es/calendar/index.js:1
__webpack_require__
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:784
  781 | };
  782 | 
  783 | // Execute the module function
> 784 | modules[moduleId].call(module.exports, module, module.exports, hotCreateRequire(moduleId));
      | ^  785 | 
  786 | // Flag the module as loaded
  787 | module.l = true;
View compiled
fn
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:150
  147 |         );
  148 |         hotCurrentParents = [];
  149 |     }
> 150 |     return __webpack_require__(request);
      | ^  151 | };
  152 | var ObjectFactory = function ObjectFactory(name) {
  153 |     return {
View compiled
Module../node_modules/antd/es/index.js
node_modules/antd/es/index.js:3
__webpack_require__
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:784
  781 | };
  782 | 
  783 | // Execute the module function
> 784 | modules[moduleId].call(module.exports, module, module.exports, hotCreateRequire(moduleId));
      | ^  785 | 
  786 | // Flag the module as loaded
  787 | module.l = true;
View compiled
fn
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:150
  147 |         );
  148 |         hotCurrentParents = [];
  149 |     }
> 150 |     return __webpack_require__(request);
      | ^  151 | };
  152 | var ObjectFactory = function ObjectFactory(name) {
  153 |     return {
View compiled
Module../src/components/AuthPage/loginPage.js
http://localhost:3000/static/js/main.chunk.js:313:62
__webpack_require__
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:784
  781 | };
  782 | 
  783 | // Execute the module function
> 784 | modules[moduleId].call(module.exports, module, module.exports, hotCreateRequire(moduleId));
      | ^  785 | 
  786 | // Flag the module as loaded
  787 | module.l = true;
View compiled
fn
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:150
  147 |         );
  148 |         hotCurrentParents = [];
  149 |     }
> 150 |     return __webpack_require__(request);
      | ^  151 | };
  152 | var ObjectFactory = function ObjectFactory(name) {
  153 |     return {
View compiled
Module../src/App.js
http://localhost:3000/static/js/main.chunk.js:127:88
__webpack_require__
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:784
  781 | };
  782 | 
  783 | // Execute the module function
> 784 | modules[moduleId].call(module.exports, module, module.exports, hotCreateRequire(moduleId));
      | ^  785 | 
  786 | // Flag the module as loaded
  787 | module.l = true;
View compiled
fn
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:150
  147 |         );
  148 |         hotCurrentParents = [];
  149 |     }
> 150 |     return __webpack_require__(request);
      | ^  151 | };
  152 | var ObjectFactory = function ObjectFactory(name) {
  153 |     return {
View compiled
Module../src/index.js
http://localhost:3000/static/js/main.chunk.js:1595:62
__webpack_require__
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:784
  781 | };
  782 | 
  783 | // Execute the module function
> 784 | modules[moduleId].call(module.exports, module, module.exports, hotCreateRequire(moduleId));
      | ^  785 | 
  786 | // Flag the module as loaded
  787 | module.l = true;
View compiled
fn
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:150
  147 |         );
  148 |         hotCurrentParents = [];
  149 |     }
> 150 |     return __webpack_require__(request);
      | ^  151 | };
  152 | var ObjectFactory = function ObjectFactory(name) {
  153 |     return {
View compiled
1
http://localhost:3000/static/js/main.chunk.js:1737:18
__webpack_require__
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:784
  781 | };
  782 | 
  783 | // Execute the module function
> 784 | modules[moduleId].call(module.exports, module, module.exports, hotCreateRequire(moduleId));
      | ^  785 | 
  786 | // Flag the module as loaded
  787 | module.l = true;
View compiled
checkDeferredModules
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:45
  42 |  }
  43 |  if(fulfilled) {
  44 |      deferredModules.splice(i--, 1);
> 45 |      result = __webpack_require__(__webpack_require__.s = deferredModule[0]);
     | ^  46 |  }
  47 | }
  48 | 
View compiled
Array.webpackJsonpCallback [as push]
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:32
  29 |  deferredModules.push.apply(deferredModules, executeModules || []);
  30 | 
  31 |  // run deferred modules when all chunks ready
> 32 |  return checkDeferredModules();
     | ^  33 | };
  34 | function checkDeferredModules() {
  35 |  var result;
View compiled
(anonymous function)
http://localhost:3000/static/js/main.chunk.js:1:65

Package.json

{
  "name": "client",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "@testing-library/jest-dom": "^4.2.4",
    "@testing-library/react": "^9.3.2",
    "@testing-library/user-event": "^7.1.2",
    "antd": "^4.2.0",
    "axios": "^0.19.2",
    "formik": "^2.1.4",
    "react": "^16.13.1",
    "react-dom": "^16.13.1",
    "react-icons": "^3.10.0",
    "react-redux": "^7.2.0",
    "react-router-dom": "^5.1.2",
    "react-scripts": "3.4.1",
    "redux": "^4.0.5",
    "yup": "^0.28.5"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "eslintConfig": {
    "extends": "react-app"
  },
  "browserslist": {
    "production": [
      ">0.2%",
      "not dead",
      "not op_mini all"
    ],
    "development": [
      "last 1 chrome version",
      "last 1 firefox version",
      "last 1 safari version"
    ]
  }
}

I have tried researching and its an error originating from moment-js yet I'm not using that module and it is also not installed.

What could be the problem?

I bootstrapped my application with create-react-app and when I run my app it compiles with warnings and it throws errors on the browser.

Error while compiling

./node_modules/rc-picker/node_modules/moment/src/lib/locale/locales.js
Module not found: Can't resolve './locale' in '/Users/macbook/Desktop/projects/pizza/Yummi-fend/node_modules/rc-picker/node_modules/moment/src/lib/locale'

Error on browser

Error: Cannot find module './locale'
▶ 2 stack frames were collapsed.
__webpack_require__
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:784
  781 | };
  782 | 
  783 | // Execute the module function
> 784 | modules[moduleId].call(module.exports, module, module.exports, hotCreateRequire(moduleId));
      | ^  785 | 
  786 | // Flag the module as loaded
  787 | module.l = true;
View compiled
fn
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:150
  147 |         );
  148 |         hotCurrentParents = [];
  149 |     }
> 150 |     return __webpack_require__(request);
      | ^  151 | };
  152 | var ObjectFactory = function ObjectFactory(name) {
  153 |     return {
View compiled
Module../node_modules/moment/src/lib/moment/moment.js
node_modules/moment/src/lib/moment/moment.js:1
__webpack_require__
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:784
  781 | };
  782 | 
  783 | // Execute the module function
> 784 | modules[moduleId].call(module.exports, module, module.exports, hotCreateRequire(moduleId));
      | ^  785 | 
  786 | // Flag the module as loaded
  787 | module.l = true;
View compiled
fn
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:150
  147 |         );
  148 |         hotCurrentParents = [];
  149 |     }
> 150 |     return __webpack_require__(request);
      | ^  151 | };
  152 | var ObjectFactory = function ObjectFactory(name) {
  153 |     return {
View compiled
Module../node_modules/moment/src/moment.js
node_modules/moment/src/moment.js:1
__webpack_require__
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:784
  781 | };
  782 | 
  783 | // Execute the module function
> 784 | modules[moduleId].call(module.exports, module, module.exports, hotCreateRequire(moduleId));
      | ^  785 | 
  786 | // Flag the module as loaded
  787 | module.l = true;
View compiled
fn
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:150
  147 |         );
  148 |         hotCurrentParents = [];
  149 |     }
> 150 |     return __webpack_require__(request);
      | ^  151 | };
  152 | var ObjectFactory = function ObjectFactory(name) {
  153 |     return {
View compiled
Module../node_modules/rc-picker/es/generate/moment.js
node_modules/rc-picker/es/generate/moment.js:1
__webpack_require__
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:784
  781 | };
  782 | 
  783 | // Execute the module function
> 784 | modules[moduleId].call(module.exports, module, module.exports, hotCreateRequire(moduleId));
      | ^  785 | 
  786 | // Flag the module as loaded
  787 | module.l = true;
View compiled
fn
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:150
  147 |         );
  148 |         hotCurrentParents = [];
  149 |     }
> 150 |     return __webpack_require__(request);
      | ^  151 | };
  152 | var ObjectFactory = function ObjectFactory(name) {
  153 |     return {
View compiled
Module../node_modules/antd/es/calendar/index.js
node_modules/antd/es/calendar/index.js:1
__webpack_require__
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:784
  781 | };
  782 | 
  783 | // Execute the module function
> 784 | modules[moduleId].call(module.exports, module, module.exports, hotCreateRequire(moduleId));
      | ^  785 | 
  786 | // Flag the module as loaded
  787 | module.l = true;
View compiled
fn
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:150
  147 |         );
  148 |         hotCurrentParents = [];
  149 |     }
> 150 |     return __webpack_require__(request);
      | ^  151 | };
  152 | var ObjectFactory = function ObjectFactory(name) {
  153 |     return {
View compiled
Module../node_modules/antd/es/index.js
node_modules/antd/es/index.js:3
__webpack_require__
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:784
  781 | };
  782 | 
  783 | // Execute the module function
> 784 | modules[moduleId].call(module.exports, module, module.exports, hotCreateRequire(moduleId));
      | ^  785 | 
  786 | // Flag the module as loaded
  787 | module.l = true;
View compiled
fn
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:150
  147 |         );
  148 |         hotCurrentParents = [];
  149 |     }
> 150 |     return __webpack_require__(request);
      | ^  151 | };
  152 | var ObjectFactory = function ObjectFactory(name) {
  153 |     return {
View compiled
Module../src/components/AuthPage/loginPage.js
http://localhost:3000/static/js/main.chunk.js:313:62
__webpack_require__
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:784
  781 | };
  782 | 
  783 | // Execute the module function
> 784 | modules[moduleId].call(module.exports, module, module.exports, hotCreateRequire(moduleId));
      | ^  785 | 
  786 | // Flag the module as loaded
  787 | module.l = true;
View compiled
fn
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:150
  147 |         );
  148 |         hotCurrentParents = [];
  149 |     }
> 150 |     return __webpack_require__(request);
      | ^  151 | };
  152 | var ObjectFactory = function ObjectFactory(name) {
  153 |     return {
View compiled
Module../src/App.js
http://localhost:3000/static/js/main.chunk.js:127:88
__webpack_require__
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:784
  781 | };
  782 | 
  783 | // Execute the module function
> 784 | modules[moduleId].call(module.exports, module, module.exports, hotCreateRequire(moduleId));
      | ^  785 | 
  786 | // Flag the module as loaded
  787 | module.l = true;
View compiled
fn
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:150
  147 |         );
  148 |         hotCurrentParents = [];
  149 |     }
> 150 |     return __webpack_require__(request);
      | ^  151 | };
  152 | var ObjectFactory = function ObjectFactory(name) {
  153 |     return {
View compiled
Module../src/index.js
http://localhost:3000/static/js/main.chunk.js:1595:62
__webpack_require__
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:784
  781 | };
  782 | 
  783 | // Execute the module function
> 784 | modules[moduleId].call(module.exports, module, module.exports, hotCreateRequire(moduleId));
      | ^  785 | 
  786 | // Flag the module as loaded
  787 | module.l = true;
View compiled
fn
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:150
  147 |         );
  148 |         hotCurrentParents = [];
  149 |     }
> 150 |     return __webpack_require__(request);
      | ^  151 | };
  152 | var ObjectFactory = function ObjectFactory(name) {
  153 |     return {
View compiled
1
http://localhost:3000/static/js/main.chunk.js:1737:18
__webpack_require__
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:784
  781 | };
  782 | 
  783 | // Execute the module function
> 784 | modules[moduleId].call(module.exports, module, module.exports, hotCreateRequire(moduleId));
      | ^  785 | 
  786 | // Flag the module as loaded
  787 | module.l = true;
View compiled
checkDeferredModules
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:45
  42 |  }
  43 |  if(fulfilled) {
  44 |      deferredModules.splice(i--, 1);
> 45 |      result = __webpack_require__(__webpack_require__.s = deferredModule[0]);
     | ^  46 |  }
  47 | }
  48 | 
View compiled
Array.webpackJsonpCallback [as push]
/Users/macbook/Desktop/projects/pizza/Yummi-fend/webpack/bootstrap:32
  29 |  deferredModules.push.apply(deferredModules, executeModules || []);
  30 | 
  31 |  // run deferred modules when all chunks ready
> 32 |  return checkDeferredModules();
     | ^  33 | };
  34 | function checkDeferredModules() {
  35 |  var result;
View compiled
(anonymous function)
http://localhost:3000/static/js/main.chunk.js:1:65

Package.json

{
  "name": "client",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "@testing-library/jest-dom": "^4.2.4",
    "@testing-library/react": "^9.3.2",
    "@testing-library/user-event": "^7.1.2",
    "antd": "^4.2.0",
    "axios": "^0.19.2",
    "formik": "^2.1.4",
    "react": "^16.13.1",
    "react-dom": "^16.13.1",
    "react-icons": "^3.10.0",
    "react-redux": "^7.2.0",
    "react-router-dom": "^5.1.2",
    "react-scripts": "3.4.1",
    "redux": "^4.0.5",
    "yup": "^0.28.5"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject"
  },
  "eslintConfig": {
    "extends": "react-app"
  },
  "browserslist": {
    "production": [
      ">0.2%",
      "not dead",
      "not op_mini all"
    ],
    "development": [
      "last 1 chrome version",
      "last 1 firefox version",
      "last 1 safari version"
    ]
  }
}

I have tried researching and its an error originating from moment-js yet I'm not using that module and it is also not installed.

What could be the problem?

• javascript
• reactjs
• react-redux
• create-react-app

• If you are not using moment, then run yarn remove moment or npm uninstall moment – Ibraheem Ahmed Commented May 2, 2020 at 18:05
• @Redline Thanks. I have tried this and it hasn't worked for me – Kinara Nyakaru Commented May 2, 2020 at 18:39
• @KinaraNyakaru Try this. Remove node-modules folder, I mean delete it and then do an npm install, See if it works – Imran Rafiq Rather Commented May 2, 2020 at 18:43
• @ImranRafiqRather Sorry I forgot to state that I tried that before and It didn't work – Kinara Nyakaru Commented May 2, 2020 at 18:56
• @KinaraNyakaru This error is a latest one and is coming due to the update in moment library.Follow the steps provided in the answer to solve it. Do please rate if it helps :) – Imran Rafiq Rather Commented May 2, 2020 at 20:20

4 Answers 4

The reason this happens is because moment has released the new version from 2.24.0 to 2.25.0

Perform the following Steps to solve this issue :

Step 1: change the versions (In your case just add the "moment":"2.24.0" to your dependencies in your package.json since I don't see it present in your package.json)

"moment": "2.24.0",
"moment-timezone": "^0.5.28",

Step 2: If you are using yarn please add resolutions in your package.json file like this

"dependencies" {
"moment": "2.24.0",
"moment-timezone": "^0.5.28"
},
"resolutions": {
"moment": "2.24.0"
},

For more information about this issue go to https://github.com/moment/moment/issues/4505

Change in package.json :

"moment": "2.25.1",

to

"moment": "2.24.0",

then run on terminal: npm install

Moment Released new version that breaks application,

as in your case there is no moment in package.json, if you simply add this to your package

moment: "2.24.0"

and run npm install it will add this moment package and resolve your issue,

otherwise you can try this cammand

npm install --save --save-exact [email protected]

it will automatically add this package to your package.json with this specific version

i hope this works for you

New moment 2.25.x versions have been released and the latest version should fix this issue.

It seems like the version 2.25.2 was addressing this issue. So a downgrade to 2.24.0 is not required anymore.