Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

JavaScript Building Applications with React and Redux Putting it all Together Updating the Player, Counter and AddPlayerForm Components

Rodrigo Novaes
Rodrigo Novaes
9,629 Points

Uncaught TypeError: _react.default.createContext is not a function

I'm getting this error and the app won't render:

Uncaught TypeError: _react.default.createContext is not a function
    at Object.<anonymous> (bundle.js:31462)
    at __webpack_require__ (bundle.js:556)
    at fn (bundle.js:87)
    at Object.<anonymous> (bundle.js:31248)
    at __webpack_require__ (bundle.js:556)
    at fn (bundle.js:87)
    at Object.<anonymous> (bundle.js:31177)
    at __webpack_require__ (bundle.js:556)
    at fn (bundle.js:87)
    at Object.<anonymous> (bundle.js:8681)

3 Answers

John Nguyen
.a{fill-rule:evenodd;}techdegree seal-36
John Nguyen
Full Stack JavaScript Techdegree Graduate 30,464 Points

I had the same issue. Similar to with what David said, it (most likely) has to do with your react-redux and redux versions.

I solved the issue by

1) downloading the project files(for this video) and copying the package.json file from the 'final' version of this video.


  "name": "react-redux-course",
  "version": "1.0.0",
  "description": "React-Redux course for Treehouse",
  "main": "src/index.js",
  "scripts": {
    "prestart": "npm run lint",
    "start": "webpack-dev-server --progress --inline --hot",
    "lint": "eslint ./src/**/*.{js, jsx} --fix",
    "test": "echo \"Error: no test specified\" && exit 1"
  "keywords": [
  "author": "Beau Palmquist",
  "license": "MIT",
  "dependencies": {
    "react": "^15.3.2",
    "react-dom": "^15.3.2",
    "react-redux": "^4.4.5",
    "redux": "^3.6.0"
  "devDependencies": {
    "babel-core": "^6.13.2",
    "babel-eslint": "^6.1.2",
    "babel-loader": "^6.2.7",
    "babel-preset-es2015": "^6.13.2",
    "babel-preset-react": "^6.11.1",
    "babel-preset-stage-0": "^6.5.0",
    "eslint": "^3.3.1",
    "eslint-plugin-react": "^6.1.2",
    "react-hot-loader": "^1.3.0",
    "webpack": "^1.13.2",
    "webpack-dev-server": "^1.16.2"

2) running npm i

And that should fix the issue.

If you are still running into issues, you'd want to check your code compared to the 'final' version of this video's code. I had to do this and I used diffchecker.com to compare my code to the 'final' version.

I receive the same TypeError, and neither of the proposed solutions by David or John corrected the issue.

David Hamilton
David Hamilton
21,522 Points

The issue is with using a newer version of react-redux with an old version of react.

You can get it to work by going into the package.json and changing the react-redux version to "^5.0.0".