Cannot load gulp: Error: Error in module

@silu44 wrote:

Hello ,
when run ( ionic serve ) this error appears but my app serve normally

[v1] [18:28:44] Cannot load gulp: Error: Error in module: .\gulpfile.js:
[v1] Error: Cannot find module 'gulp-clean-css'
[v1]     at Function.Module._resolveFilename (internal/modules/cjs/loader.js:582:15)
[v1]     at Function.Module._load (internal/modules/cjs/loader.js:508:25)
[v1]     at Module.require (internal/modules/cjs/loader.js:637:17)
[v1]     at require (internal/modules/cjs/helpers.js:22:18)
[v1]     at Object.<anonymous> (F:\Ionic\New\sudafax\gulpfile.js:3:16)
[v1]     at Module._compile (internal/modules/cjs/loader.js:701:30)
[v1]     at Object.Module._extensions..js (internal/modules/cjs/loader.js:712:10)
[v1]     at Module.load (internal/modules/cjs/loader.js:600:32)
[v1]     at tryModuleLoad (internal/modules/cjs/loader.js:539:12)
[v1]     at Function.Module._load (internal/modules/cjs/loader.js:531:3)

Here is the Old Package.json

{
  "name": "sudafax",
  "version": "0.0.1",
  "description": "An Ionic project",
  "devDependencies": {
    "gulp": "^3.5.6",
    "gulp-clean-css": "^3.7.0",
    "gulp-rename": "^1.2.0",
    "gulp-sass": "^3.1.0"
  },
  "dependencies": {
    "cordova-android": "^6.4.0"
  },
  "cordova": {
    "plugins": {
      "cordova-android-play-services-gradle-release": {
        "PLAY_SERVICES_VERSION": "15.+"
      }
    }
  }
}

and this is my new package.json

{
  "name": "sudafax",
  "version": "1.1.3",
  "devDependencies": {
    "@ionic/lab": "1.0.24",
    "cordova-plugin-device": "^2.0.2",
    "cordova-plugin-ionic-keyboard": "^2.1.3",
    "cordova-plugin-ionic-webview": "^4.0.1",
    "cordova-plugin-splashscreen": "^5.0.2",
    "cordova-plugin-statusbar": "^2.4.2",
    "cordova-plugin-whitelist": "^1.3.3",
    "gulp": "^4.0.1"
  },
  "cordova": {
    "plugins": {
      "cordova-plugin-whitelist": {},
      "cordova-plugin-statusbar": {},
      "cordova-plugin-device": {},
      "cordova-plugin-splashscreen": {},
      "cordova-plugin-ionic-webview": {
        "ANDROID_SUPPORT_ANNOTATIONS_VERSION": "27.+"
      },
      "cordova-plugin-ionic-keyboard": {}
    },
    "platforms": [
      "android"
    ]
  },
  "dependencies": {
    "cordova-android": "8.0.0",
    "gulp-sass": "^4.0.2"
  }
}

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