Angular2/nativeScript：奇怪的错误，抱怨组件未导入任何模块，即使它已导入主模块

Question

I am busy with a small barcode scanner app which has a SettingsComponent where a local IP can be set. The app builds with no issues but when it gets deployed on a genymotion emulator I get the below error. It seems like it can't find SettingsComponent even though I imported it in my app.module.ts... (it gets added to the declarations array in the "...NavigatableComponents" code is below). Any idea why this is happening and How I can go about fixing it?

my error:

An uncaught Exception occurred on "main" thread. java.lang.RuntimeException: Unable to resume activity {org.nativescript.barcodescanner/com.tns.NativeScriptActivity}: com.tns.NativeScriptException: Calling js method onCreateView failed

Error: Component SettingsComponent is not part of any NgModule or the module has not been imported into your module. File: "/data/data/org.nativescript.barcodescanner/files/app/tns_modules/@angular/compiler/bundles/compiler.umd.js, line: 17126, column: 14

StackTrace:

Frame: function:'RuntimeCompiler._createCompiledHostTemplate', file:'/data/data/org.nativescript.barcodescanner/files/app/tns_modules/@angular/compiler/bundles/compiler.umd.js', line: 17126, column: 21 Frame: function:'', file:'/data/data/org.nativescript.barcodescanner/files/app/tns_modules/@angular/compiler/bundles/compiler.umd.js', line: 17085, column: 39 Frame: function:'', file:'/data/data/org.nativescript.barcodescanner/files/app/tns_modules/@angular/compiler/bundles/compiler.umd.js', line: 17083, col

my settings.html:

<StackLayout class="page">
<Label class="h1 title m-x-auto " text="Settings"></Label>
<StackLayout class="form" *ngIf="!IPSaved">
<TextField class="form-input border" placeholder="Enter IP"></TextField>
<Button class="btn btn-primary" text="Submit"></Button>
</StackLayout>
<StackLayout *ngIf="IPSaved">
    <Label class="h1" text="IP Submitted successfully"></Label>
    <Button class="btn btn-primary" text="Done" [nsRouterLink]="['/home']"></Button>
</StackLayout>
</StackLayout>

my settings.component.ts:

import { Component,} from '@angular/core';

import { RestService } from '../../services/rest.service';
import { AppSettingsService } from '../../services/app-settings.service';

@Component({
  selector: 'settings',
  templateUrl: './pages/settings/settings.component.html'
})
export class SettingsComponent {
  ipSaved: boolean;

  constructor(private restService: RestService, private appSettingsService: AppSettingsService) {

  }

    submitIP(ip: string) {
        this.appSettingsService.saveLocalIP(ip);
        this.restService.init(ip);
        this.ipSaved = true;
    }

}

my app.module.ts:

import { NgModule, ValueProvider } from "@angular/core";
import { NativeScriptFormsModule } from "nativescript-angular/forms";
import { NativeScriptModule } from "nativescript-angular/platform";
import { NativeScriptRouterModule } from 'nativescript-angular/router'
import { NativeScriptHttpModule } from 'nativescript-angular/http';


import { BarcodeScanner } from "nativescript-barcodescanner";
import { RestService } from './services/rest.service';
import { appSettingsService } from './services/app-settings.service';
import { AppComponent } from "./app.component";
import { HomeComponent } from "./pages/home/home.component";
import { CheckBarcodesComponent } from './pages/check-barcodes/check-barcodes.component';
import { SettingsComponent } from './pages/settings/settings.component';

import { routes, navigatableComponents } from './app.routing';
@NgModule({
    imports : [
    NativeScriptModule,     
    NativeScriptFormsModule ,
    NativeScriptHttpModule,
    NativeScriptRouterModule,
    NativeScriptRouterModule.forRoot(routes)
    ],
    declarations : [
    AppComponent,   
    ...navigatableComponents
    ],
    providers : [
    RestService,
    BarcodeScanner],
    bootstrap : [AppComponent]      
})
export class AppModule {}

my app.routing.ts:

import { AppComponent } from './app.component';
import { HomeComponent } from './pages/home/home.component';
import { CheckBarcodesComponent } from './pages/check-barcodes/check-barcodes.component';
import { SettingsComponent } from './pages/settings/settings.component';

export const routes = [
    {path: "", component: HomeComponent},
        {path: "checkBarcodes", component: CheckBarcodesComponent},
            {path: "settings", component: SettingsComponent}
];

export const navigatableComponents = [
HomeComponent,
CheckBarcodesComponent,
SettingsComponent
];

Answer 1

Guessing a bit, but I think app.module.ts should have this import: import { AppSettingsService } from './services/app-settings.service'; (mind uppercase 'A') and you need to add AppSettingsService to the list of providers in the same class.