ionic buile error: No provider for LocalNotifications

Error message:

core.js:6140 ERROR NullInjectorError: R3InjectorError(AppModule)[cls_localnotifications -> LocalNotifications -> LocalNotifications -> LocalNotifications]: 

  NullInjectorError: No provider for LocalNotifications!

Soluction:

app.module.ts  add:

import { LocalNotifications } from '@ionic-native/local-notifications/ngx';

providers: [

    LocalNotifications,

]