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

To resolve this issue I did

ng generate service InMemoryData --module=app  

as suggested by user user875234

But also a lot of answers here have copied and pasted from the question

import { InMemoryDataService } from './in-memory-data-service';  

Which is wrong. It should be as it appears in the Heroes tutorial

import { InMemoryDataService } from './in-memory-data.service';  

Notice the "dataDOTservice", not a hyphen. It looks to us newbies like a mistake in the tutorial, and it doesn't match OP's question or some answers here. The dot is correct, the hyphen is wrong.