Errors while running "ionic build --prod"

[ionitron-bot[bot]]

Ionic version: (check one with "x") (For Ionic 1.x issues, please use https://github.com/ionic-team/ionic-v1) [ ] 2.x [ x ] 3.x [ ] 4.x

I'm submitting a ... (check one with "x") [ x ] bug report [ ] feature request

Current behavior:

While running with command "ionic cordova build android --prod --release" I got an error like below:

Module not found: Error: Can't resolve '../../node_modules/hj/flow/ReturnTaskUserControl.ngfactory' in 'F:\HJAGP\src\Android\BuildAndroid\AndroidApp\src\app'
resolve '../../node_modules/hj/flow/ReturnTaskUserControl.ngfactory' in 'F:\HJAGP\src\Android\BuildAndroid\AndroidApp\src\app'
  using description file: F:\HJAGP\src\Android\BuildAndroid\AndroidApp\package.json (relative path: ./src/app)
    Field 'browser' doesn't contain a valid alias configuration
  after using description file: F:\HJAGP\src\Android\BuildAndroid\AndroidApp\package.json (relative path: ./src/app)
    using description file: F:\HJAGP\src\Android\BuildAndroid\AndroidApp\node_modules\hj\flow\package.json (relative path: ./ReturnTaskUserControl.ngfactory)
      no extension
        Field 'browser' doesn't contain a valid alias configuration
        F:\HJAGP\src\Android\BuildAndroid\AndroidApp\node_modules\hj\flow\ReturnTaskUserControl.ngfactory doesn't exist
      .ts
        Field 'browser' doesn't contain a valid alias configuration
        F:\HJAGP\src\Android\BuildAndroid\AndroidApp\node_modules\hj\flow\ReturnTaskUserControl.ngfactory.ts doesn't exist
      .js
        Field 'browser' doesn't contain a valid alias configuration
        F:\HJAGP\src\Android\BuildAndroid\AndroidApp\node_modules\hj\flow\ReturnTaskUserControl.ngfactory.js doesn't exist
      .json
        Field 'browser' doesn't contain a valid alias configuration
        F:\HJAGP\src\Android\BuildAndroid\AndroidApp\node_modules\hj\flow\ReturnTaskUserControl.ngfactory.json doesn't exist
      as directory
        F:\HJAGP\src\Android\BuildAndroid\AndroidApp\node_modules\hj\flow\ReturnTaskUserControl.ngfactory doesn't exist
[F:\HJAGP\src\Android\BuildAndroid\AndroidApp\node_modules\hj\flow\ReturnTaskUserControl.ngfactory]
[F:\HJAGP\src\Android\BuildAndroid\AndroidApp\node_modules\hj\flow\ReturnTaskUserControl.ngfactory.ts]
[F:\HJAGP\src\Android\BuildAndroid\AndroidApp\node_modules\hj\flow\ReturnTaskUserControl.ngfactory.js]
[F:\HJAGP\src\Android\BuildAndroid\AndroidApp\node_modules\hj\flow\ReturnTaskUserControl.ngfactory.json]
[F:\HJAGP\src\Android\BuildAndroid\AndroidApp\node_modules\hj\flow\ReturnTaskUserControl.ngfactory]
 @ ./src/app/app.module.ngfactory.js 38:0-82
 @ ./src/app/main.ts
    at BuildError.Error (native)
    at new BuildError (F:\HJAGP\src\Android\BuildAndroid\AndroidApp\node_modules\@ionic\app-scripts\dist\util\errors.js:16:28)
    at callback (F:\HJAGP\src\Android\BuildAndroid\AndroidApp\node_modules\@ionic\app-scripts\dist\webpack.js:121:28)
    at emitRecords.err (F:\HJAGP\src\Android\BuildAndroid\AndroidApp\node_modules\webpack\lib\Compiler.js:269:13)
    at Compiler.emitRecords (F:\HJAGP\src\Android\BuildAndroid\AndroidApp\node_modules\webpack\lib\Compiler.js:375:38)
    at emitAssets.err (F:\HJAGP\src\Android\BuildAndroid\AndroidApp\node_modules\webpack\lib\Compiler.js:262:10)
    at applyPluginsAsyncSeries1.err (F:\HJAGP\src\Android\BuildAndroid\AndroidApp\node_modules\webpack\lib\Compiler.js:368:12)
    at next (F:\HJAGP\src\Android\BuildAndroid\AndroidApp\node_modules\tapable\lib\Tapable.js:218:11)
    at Compiler.compiler.plugin (F:\HJAGP\src\Android\BuildAndroid\AndroidApp\node_modules\webpack\lib\performance\SizeLimitsPlugin.js:99:4)
    at Compiler.applyPluginsAsyncSeries1 (F:\HJAGP\src\Android\BuildAndroid\AndroidApp\node_modules\tapable\lib\Tapable.js:222:13)

Expected behavior:

Steps to reproduce:

I tried running ".\node_modules\.bin\ngc" but got no errors (screenshot below):

Other information:

Ionic info: (run ionic info from a terminal/cmd prompt and paste output below):

cli packages: (C:\Users\Administrator\AppData\Roaming\npm\node_modules)

    @ionic/cli-utils  : 1.19.1
    ionic (Ionic CLI) : 3.19.1

global packages:

    cordova (Cordova CLI) : 8.0.0
    Gulp CLI              : CLI version 3.9.1 Local version 3.9.1

local packages:

    @ionic/app-scripts : 3.1.8
    Cordova Platforms  : none
    Ionic Framework    : ionic-angular 3.9.2

System:

    Android SDK Tools : 25.2.3
    Node              : v6.9.1
    npm               : 3.10.8
    OS                : Windows 7

Environment Variables:

    ANDROID_HOME : G:\Android\sdk

Misc:

    backend : legacy

[zaarheed]

Did you try running npm install before you ran the build command?

[RZR666]

yes, I've cleared the node_modules folder and tried again.