NullInjectorError: No provider for NgxPrinterService! about ngx-printer-demo HOT 3 CLOSED

I got same problem and I figured out how to make it works.
There is only mention like this in readme.md.
" Add to main app.module imports "

It means you have to write code like below in app.module.ts

import { NgxPrinterModule, NgxPrinterService } from 'ngx-printer';

imports: [
  NgxPrinterModule.forRoot({printOpenWindow: false}),
],
providers: [
  NgxPrinterService
],

I hope it will help u

from ngx-printer-demo.

@LouiMinister, Thanks, that works for me.
If i want use the directives i've to import them too?

from ngx-printer-demo.

solution provided

from ngx-printer-demo.