Browser not opening after gulp watch?

Question

Layout

here is gulpfile.js - https://codepen.io/anon/pen/GaRxVo
here is package.json

{
  "name": "myproject",
  "version": "1.0.0",
  "description": "",
  "main": "gulpfile.js",
  "dependencies": {
    "browser-sync": "^2.26.5",
    "g": "^2.0.1",
    "gulp-concat": "^2.6.1",
    "gulp-autoprefixer": "^6.1.0",
    "gulp-cssnano": "^2.1.3",
    "gulp-uglifyjs": "^0.6.2",
    "gulp-rename": "^1.4.0"
  },
  "devDependencies": {
    "del": "^4.1.1",
    "gulp": "^4.0.1",
    "gulp-cache": "^1.1.1",
    "gulp-imagemin": "^5.0.3",
    "gulp-pngquant": "^1.0.12",
    "gulp-sass": "^4.0.2"
  },
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC"
}