Please, set "CHROME_BIN" env variable error on cloud9 package.json

package.json

{
  "repository": {
  "type": "git",
  "url": "https://github.com/ddeveloperr/react-timer.git"
},  
  "name": "react-timer",
  "version": "1.0.0",
  "description": "React timer app",
  "main": "index.js",
  "scripts": {
    "test": "karma start",
    "start": "node server.js"
  },
  "author": "Kemal Cholovich",
  "license": "MIT",
  "dependencies": {
    "axios": "^0.9.1",
    "express": "^4.13.4",
    "react": "^0.14.7",
    "react-dom": "^0.14.7",
    "react-router": "^2.0.0"
  },
  "devDependencies": {
    "babel-core": "^6.5.1",
    "babel-loader": "^6.2.2",
    "babel-preset-es2015": "^6.5.0",
    "babel-preset-react": "^6.5.0",
    "babel-preset-stage-0": "^6.5.0",
    "css-loader": "^0.23.1",
    "expect": "^1.14.0",
    "foundation-sites": "6.2.0",
    "jquery": "^2.2.1",
    "karma": "^0.13.22",
    "karma-chrome-launcher": "^0.2.2",
    "karma-mocha": "^0.2.2",
    "karma-mocha-reporter": "^2.0.0",
    "karma-sourcemap-loader": "^0.3.7",
    "karma-webpack": "^1.7.0",
    "mocha": "^2.4.5",
    "node-sass": "^3.4.2",
    "sass-loader": "^3.1.2",
    "script-loader": "^0.6.1",
    "style-loader": "^0.13.0",
    "webpack": "^1.12.13"
  }
}