NullInjectorError: No provider for Contacts!

[leandroblanes]

Bug Report

Problem

I followed the documentation of the link https://ionicframework.com/docs/native/contacts but when running on the device I get the error 'NullInjectorError: No provider for Contacts!'

Chrome Inspect Log

ERROR Error: StaticInjectorError(AppModule)[Contacts]: StaticInjectorError(Platform: core)[Contacts]: NullInjectorError: No provider for Contacts! at NullInjector.push../node_modules/@angular/core/fesm5/core.js.NullInjector.get (core.js:8895) at resolveToken (core.js:9140) at tryResolveToken (core.js:9084) at StaticInjector.push../node_modules/@angular/core/fesm5/core.js.StaticInjector.get (core.js:8981) at resolveToken (core.js:9140) at tryResolveToken (core.js:9084) at StaticInjector.push../node_modules/@angular/core/fesm5/core.js.StaticInjector.get (core.js:8981) at resolveNgModuleDep (core.js:21217) at NgModuleRef_.push../node_modules/@angular/core/fesm5/core.js.NgModuleRef_.get (core.js:21906) at injectInjectorOnly (core.js:1773)

Ionic Info

`Ionic:

ionic (Ionic CLI) : 4.12.0 (C:\Users\Leandro\AppData\Roaming\npm\node_modules\ionic)
Ionic Framework : @ionic/angular 4.1.1
@angular-devkit/build-angular : 0.13.5
@angular-devkit/schematics : 7.2.4
@angular/cli : 7.3.5
@ionic/angular-toolkit : 1.4.0

Cordova:

cordova (Cordova CLI) : 8.1.2 (cordova-lib@8.1.1)
Cordova Platforms : android 7.1.4
Cordova Plugins : not available

System:

Android SDK Tools : 26.1.1 (C:\Users\Leandro\AppData\Local\Android\Sdk)
NodeJS : v8.12.0 (C:\Program Files\nodejs\node.exe)
npm : 6.7.0
OS : Windows 7`

[Bramzor]

This is basic angular and has nothing to do with this plugin. You always need to add an import inside app.module.ts and add it to the Providers array.

[DaSchTour]

This is basic angular and has nothing to do with this plugin. You always need to add an import inside app.module.ts and add it to the Providers array.

I'm not sure if that's so clear to everyone. The documentation of the plugins doesn't tell about this. And from angular you could expect, that Injectable could be provided at root and would not need any provider declaration.

[breautek]

The documentation of the plugins doesn't tell about this.

We don't document any details on any particular framework. Doing so would be a major hurdle in maintenance, especially for the small volunteer team that we are. Cordova documents the API that Cordova defines and any potential quirks you may run into on a particular OS / webview platform. Anything outside of that is out of scope.