public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
            app.UseWebpackDevMiddleware(new WebpackDevMiddlewareOptions
            {
                HotModuleReplacement = true
            });
        }
        else
        {
            app.UseExceptionHandler("/Home/Error");
            app.UseHsts();
        }

        app.UseHttpsRedirection();
        app.UseStaticFiles();
        app.UseCookiePolicy();

        app.UseMvc(routes =>
        {
            routes.MapRoute(
                name: "default",
                template: "{controller=Home}/{action=Index}/{id?}");
        });
    }

{
 "name": "streamline",
 "version": "1.0.0",
 "description": "",
 "main": "index.js",
 "scripts": {
  "test": "echo "Error: no test specified" && exit 1",
  "wbp": "webpack"
 },
 "keywords": [],
 "author": "",
 "license": "ISC",
 "devDependencies": {
  "aspnet-webpack": "^3.0.0",
  "bootstrap": "^4.1.2",
  "css-loader": "^1.0.0",
  "extract-text-webpack-plugin": "^4.0.0-beta.0",
  "jquery": "^3.3.1",
  "popper.js": "^1.14.3",
  "style-loader": "^0.21.0",
  "uglifyjs-webpack-plugin": "^1.2.7",
  "webpack": "^4.16.1",
  "webpack-cli": "^3.0.8",
  "webpack-hot-middleware": "^2.22.2"
 },
 "dependencies": {
  "@babel/core": "^7.0.0-beta.53",
  "@babel/preset-env": "^7.0.0-beta.53",
  "babel-loader": "^8.0.0-beta.4"
 }
}

Exception has occurred: CLR/System.AggregateException
An exception of type 'System.AggregateException' occurred in System.Private.CoreLib.dll but was not handled in user code: 'One or