I have followed the Tutorial. After changing app/maint.ts in the Http chapter I get the error when starting the app via command line:
app/maint.ts
ap
I had the same problem, I changed in systemjs.config :
'angular2-in-memory-web-api': { defaultExtension: 'js' },
By this line :
'angular2-in-memory-web-api': { main: 'core.js', defaultExtension: 'js' },