Cannot find module './in-memory-data-service' in tour of heroes for Angular2

Question

I am trying to work through the Angular2 tour of heroes app, and am running into bugs on the Http section of the tutorial.

At first I was getting the error:

Answer 1

I solved this issue by running the following cmd:

$ yarn add angular-in-memory-web-api

Run this if you are using npm:

$ npm i angular-in-memory-web-api