Jhipster webpack production ERROR in ./src/main/webapp/app/app.main.ts ,Module not found:Error: Can't resolve './app.module.ngfactory'

When did I run yarn run webpack:prod ,

it showed -> ERROR in ./src/main/webapp/app/app.main.ts Module not found: Error: Can't resolve './app.module.ngfactory' in '/home/myProject/src/main/webapp/app' @ ./src/main/webapp/app/app.main.ts 2:0-62

I am using :
Jhipster version : 4.13.3
Angular : 5.1.0
Jdk-1.8
os - ubuntu 18.04

Here I have shared my package.json file as well.

package.json

{ "name": "myProject", "version": "0.0.0", "description": "Description for bookingspider", "private": true, "license": "UNLICENSED", "cacheDirectories": [ "node_modules" ], "dependencies": { "@angular/animations": "^5.1.0", "@angular/common": "5.1.0", "@angular/compiler": "5.1.0", "@angular/core": "5.1.0", "@angular/forms": "5.1.0", "@angular/http": "5.1.0", "@angular/platform-browser": "5.1.0", "@angular/platform-browser-dynamic": "5.1.0", "@angular/router": "5.1.0", "@ng-bootstrap/ng-bootstrap": "1.0.0", "bootstrap": "4.1.3", "core-js": "2.4.1", "font-awesome": "^4.7.0", "jquery": "^3.3.1", "ng-jhipster": "0.3.6", "ngx-cookie": "2.0.1", "ngx-infinite-scroll": "0.5.1", "ngx-webstorage": "2.0.1", "node-sass": "^4.11.0", "primeicons": "^1.0.0", "primeng": "^5.0.0", "reflect-metadata": "0.1.10", "rxjs": "5.5.5", "sockjs-client": "1.1.4", "swagger-ui": "2.2.10", "tether": "1.4.0", "webstomp-client": "1.0.6", "zone.js": "0.8.16" }, "devDependencies": { "@angular/cli": "^1.7.4", "@angular/compiler-cli": "5.1.0", "@ngtools/webpack": "1.8.5", "@types/jasmine": "2.5.53", "@types/node": "8.0.18", "angular2-template-loader": "0.6.2", "awesome-typescript-loader": "3.2.2", "browser-sync": "2.18.13", "browser-sync-webpack-plugin": "1.2.0", "codelyzer": "4.0.1", "copy-webpack-plugin": "4.2.3", "css-loader": "0.28.4", "exports-loader": "0.6.4", "extract-text-webpack-plugin": "3.0.2", "file-loader": "1.1.5", "generator-jhipster": "4.13.3", "html-loader": "0.5.0", "html-webpack-plugin": "2.30.1", "jasmine-core": "2.7.0", "karma": "1.7.1", "karma-chrome-launcher": "2.2.0", "karma-coverage": "1.1.1", "karma-intl-shim": "1.0.3", "karma-jasmine": "1.1.0", "karma-junit-reporter": "1.2.0", "karma-notify-reporter": "1.0.1", "karma-phantomjs-launcher": "1.0.4", "karma-remap-istanbul": "0.6.0", "karma-sourcemap-loader": "0.3.7", "karma-webpack": "2.0.4", "merge-jsons-webpack-plugin": "1.0.11", "phantomjs-prebuilt": "2.1.16", "postcss-loader": "2.0.9", "proxy-middleware": "0.15.0", "rimraf": "2.6.1", "sass-loader": "6.0.6", "sourcemap-istanbul-instrumenter-loader": "0.2.0", "style-loader": "0.18.2", "to-string-loader": "1.1.5", "tslint": "5.5.0", "tslint-loader": "3.5.3", "typescript": "2.5.3", "uglifyjs-webpack-plugin": "1.1.5", "web-app-manifest-loader": "0.1.1", "webpack": "3.10.0", "webpack-dev-server": "^2.9.5", "webpack-merge": "4.1.1", "webpack-notifier": "1.5.0", "webpack-visualizer-plugin": "0.1.11", "workbox-webpack-plugin": "3.0.0-beta.1", "write-file-webpack-plugin": "4.1.0", "xml2js": "0.4.17" }, "engines": { "node": ">=6.9.0" }, "scripts": { "lint": "tslint --project tsconfig.json -e 'node_modules/**'", "lint:fix": "yarn run lint -- --fix", "ngc": "ngc -p tsconfig-aot.json", "cleanup": "rimraf target/{aot,www}", "clean-www": "rimraf target//www/app/{src,target/}", "start": "yarn run webpack:dev", "serve": "yarn run start", "build": "yarn run webpack:prod", "test": "yarn run lint && karma start src/test/javascript/karma.conf.js", "test:watch": "yarn test -- --watch", "webpack:dev": "yarn run webpack-dev-server -- --config webpack/webpack.dev.js --progress --inline --hot --profile --port=9060 --watch-content-base", "webpack:build:main": "yarn run webpack -- --config webpack/webpack.dev.js --progress --profile", "webpack:build": "yarn run cleanup && yarn run webpack:build:main", "webpack:prod:main": "yarn run webpack -- --config webpack/webpack.prod.js --progress --profile", "webpack:prod": "yarn run cleanup && yarn run webpack:prod:main && yarn run clean-www", "webpack:test": "yarn run test", "webpack-dev-server": "node --max_old_space_size=8000 node_modules/webpack-dev-server/bin/webpack-dev-server.js", "webpack": "node --max_old_space_size=8000 node_modules/webpack/bin/webpack.js", "postinstall": "node node_modules/phantomjs-prebuilt/install.js" } }

app.main.ts :

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { ProdConfig } from './blocks/config/prod.config';
import { MyProjectAppModule } from './app.module';

ProdConfig();

if (module['hot']) {
    module['hot'].accept();
}

platformBrowserDynamic().bootstrapModule(MyProjectAppModule)
.then((success) => console.log(`Application started`))
.catch((err) => console.error(err));

I tried every possible solution I could find on google and nothing worked.

Can anyone please help me for this issue? TIA