auth0 token: Failed to compile

Question

I've been learning Asp.net core and angular from scratch

I am watching a video. And i am sure that i'm following the instructions in the video.

I installed the library using npm

npm install @auth0/angular-jwt

Then i'm having this error

Failed to compile.

../node_modules/@auth0/angular-jwt/index.js
Module not found: Error: Can't resolve '@angular/common/http' in 'C:\Users\dev\Documents\Visual Studio 2017\Projects\DatingApp\node_modules\@auth0\angular-jwt'

What is the cause of it? i re watch the video thrice in order to find what's wrong but i can't solve it.

When i imported the JwtHelperService the intelisense of the editor i am using pops up. So im assuming that the JwtHelperService is installed properly.

i also added jwtHelper = new JwtHelperService(); variable

and created a method like this

loggedIn() {
  const token = localStorage.getItem('token');
  return !this.jwtHelper.isTokenExpired(token);
}

But where does the error came from? How can i solve it?

Update:

Its giving me error when i add a variable

 jwtHelper = new JwtHelperService();

Regards, Ramon