Problems with webpack

saludes structure a project with babel, sass and gulp at the time of packaging I receive this error .

• I'm on Ubuntu 18.
• node: v9.8.0 gulp-cli: 2.0.1

then I show the dependencies of the project

  "devDependencies": {
    "babel-cli": "^6.26.0",
    "babel-preset-es2015": "^6.24.1",
    "gulp": "^3.9.1",
    "gulp-babel": "^7.0.1",
    "gulp-sass": "^4.0.1",
    "webpack": "^4.8.0"
  }

next I show the error