Fix: The Dnx Runtime package needs to be installed. See output window for more details

I do not know what caused the problem, but at a given moment, I got the error:


The Dnx Runtime package needs to be installed. See output window for more details


To fix this problem I entered the following commands in the package manager console:


dnvm upgrade

dnvm upgrade –r CoreClr

dnu restore


Closed all visual studio 2015 instances and opened the project,  now I could build the project wihout errors.


Found my solution at:

Fix: ECMDERR Failed to execute "git ls-remote –tags –heads git://", exit code of #128

When I wanted to install a bower package inside Microsoft Visual Studio 2015 update 1 (inside a corporate netwerok), I got the error:

ECMDERR Failed to execute "git ls-remote –tags –heads git://", exit code of #128


This solution:

Enter the following command on the commandline:

git config –global url."https://".insteadOf git://

Starting with ASP.NET 5, TypeScript 1.7 and the ES6 module syntax compiled to ES5.

In the previous post I described how you can get started with ASP.NET 5.


The code used in this blog post can be found at:


In this post I will describe how you can get start using TypeScript 1.7 and the ES6 module syntax to order your code in an ASP.NET 5 application.


I will explain how you can use a “library” module inside your app code, by using TypeScript and the ES6 module syntax.

The compiled code will be in ES5, so we need a library called “system.js” to load the “ES6 modules” at runtime.


  • After you followed the steps in the previous post
  • Add a TypeScript JSON Configuration File to the wwwroot folder




Add "module": "system", under compileroptions:




Add two typescript files:

  • wwwroot/core/app.ts
  • wwwroot/libraries/list/findIndexByItem.ts





  • Add the system.js bower package.

This is needed, because the typescript will be compiled into javascript modules.

These modules are in the “system.require” format.

We could use other module formats (see tsconfig.json), but in this example I wanted to use system.js


Before we can add the system.js bower package, add a “Bower Configuration File” to the root of the project.




In this example I use the folder “wwwroot/libraries” to store all my runtime JavaScript dependencies, so we have to edit the .bowerrc file, change:{ “directory”: “wwwroot/lib” } to { “directory”: “wwwroot/libraries” } .




Now we can install the system.js bower package:

















The only javascript file we directly load in the index.html is “/libraries/system.js/dist/system.js”. All other logic will be dynamically loaded by the system.js loader.


To  make system.js recognize file paths like System.register(["../libraries/list/findIndexByItem"] , so without the “*.js” extension, we need to add a little configuration by using System.config, then we load the “core/app.js” file and start the application.

The “core/app.js” uses the library module “findIndexByItem.js”. This JavaScript file will be dynamically loaded, when “core/app.js” is requested.










Note: for browsers that do not support promises you need a promise polyfill, that can be found, here:

Starting with ASP .NET 5 (empty project) and static files.


If you are starting with ASP .NET 5 (1.0.0-rc1-final) and you just want to serve an “index.html”, you can follow these steps:

  • Start Visual Studio 2015
  • File > New > Project…
  • Installed > Templates > Visual C# > Web > ASP.NET Web Application
  • Choose .NET Framework 4.6.1



  • ASP.NET 5 Templates > Empty



  • Open project.json and add package dependency “Microsoft.AspNet.StaticFiles”: “1.0.0-rc1-final”:




  • Open Startup.cs and remove the app.Run lines:



  • In Startup.cs add the follwoing lines in the Configure methode beneath app.UseIISPlatformHandler();:
    • app.UseDefaultFiles();
    • app.UseStaticFiles();
  • Like so:




  • Add an index.html file to the wwwroot folder and add the text “Hello world from html” to the body:






Press F5 and the a browser should appear showing you the “Hello world from html”



Fix: TypeScript 1.7.6 compile on save in Visual Studio 2015 not working

I upgraded Visual Studio 2015 TypeScript extension to 1.7.6, then compile on save stopped working.

First I checked if “Compile on save” was enabled on my 4.5.2 web project properties (TypeScript Build tab):




Then I checked if “Automatically compile TypeScript file which are not part of a project” was enabled (Tools / Options).




Then the TypeScript files still would not compile on save (they were compiled, when the project was build, but not when a TypeScript file was saved.


The solution

I removed the following part in my Web.csproj file:


<PropertyGroup Condition="’$(Configuration)|$(Platform)’ == ‘Debug|AnyCPU’">
    <TypeScriptOutFile />
    <TypeScriptOutDir />
    <TypeScriptMapRoot />
    <TypeScriptSourceRoot />


Then I added a tsconfig.json file to the root of my project:




  "compilerOptions": {
    "noImplicitAny": true,
    "sourceMap": true,
    "target": "es5"




Don’t now if both steps are needed, but after that, my compile on save started working again.