Something in your build process is loading the wrong version

Question

I am getting following error. Can't figure out solution. I found many post which looks duplicate here but, nothing work.

like: Requires Babel "7.0.0-0" but was loaded with "6.26.3"

node_modules@babel\helper-plugin-utils\lib\index.js

throw Object.assign(err, {

Error: Requires Babel "^7.0.0-0", but was loaded with "6.26.3". If you are sure you have a compatible version of @babel/core, it is likely that something in your build process is loading the wrong version. Inspect the stack trace of this error to look for the first entry that doesn't mention "@babel/core" or "babel-core" to see what is calling Babel.

Here following is my package.json

"dependencies": {
    "express": "^4.16.4",
    "isomorphic-fetch": "^2.2.1",
    "react": "^16.6.3",
    "react-dom": "^16.6.3",
    "react-redux": "^5.1.1",
    "react-router": "^4.3.1",
    "react-router-config": "^1.0.0-beta.4",
    "react-router-dom": "^4.3.1",
    "redux": "^4.0.1",
    "redux-thunk": "^2.3.0"
  },
  "devDependencies": {
    "@babel/cli": "^7.2.3",
    "@babel/core": "^7.2.2",
    "@babel/plugin-proposal-class-properties": "^7.2.0",
    "@babel/plugin-transform-runtime": "^7.2.0",
    "@babel/preset-env": "^7.3.1",
    "@babel/preset-react": "^7.0.0",
    "babel-core": "^7.0.0-bridge.0",
    "babel-jest": "^24.0.0",
    "babel-loader": "^7.1.5",
    "css-loader": "^1.0.1",
    "cypress": "^3.1.3",
    "enzyme": "^3.8.0",
    "enzyme-adapter-react-16": "^1.7.1",
    "enzyme-to-json": "^3.3.5",
    "extract-text-webpack-plugin": "^4.0.0-beta.0",
    "html-webpack-plugin": "^3.2.0",
    "jest": "^24.0.0",
    "jest-fetch-mock": "^2.0.1",
    "json-loader": "^0.5.7",
    "nodemon": "^1.18.9",
    "npm-run-all": "^4.1.5",
    "open": "0.0.5",
    "redux-devtools": "^3.4.2",
    "redux-mock-store": "^1.5.3",
    "regenerator-runtime": "^0.13.1",
    "style-loader": "^0.23.1",
    "uglifyjs-webpack-plugin": "^2.0.1",
    "webpack": "^4.26.1",
    "webpack-cli": "^3.1.2",
    "webpack-dev-server": "^3.1.14",
    "webpack-node-externals": "^1.7.2"
  },
  "babel": {
    "presets": [
      "@babel/preset-env",
      "@babel/preset-react"
    ],
    "plugins": [
      "@babel/plugin-transform-runtime",
      "@babel/plugin-proposal-class-properties"
    ]
  }

I am getting on npm start.

"start": "webpack -d && nodemon --exec babel-node ./server"

Answer 1

Found it :-)

I noticed that babel-node is not among your dependencies, therefore you must be using a global version of babel-node, likely version 6... So, just add the correct one into your devDependencies:

npm install --save-dev @babel/node