Cannot find external module 'angular2/angular2' - Angular2 w/ Typescript

Question

I am going through the step by step tutorial on angular.io (Angular 2). I am using typescript. I get the following error when trying to compile:

Cannot find ex

Answer 1

I hit this problem too and then typed everything exactly as specified in the instructions and everything worked (imagine that). Originally I had tried to just install the latest version of angular and systemjs. However using the specific versions noted on the quickstart page resolved the issue for me.