Error: Unexpected value 'undefined' imported by the module

I'm getting this error after migrating to NgModule, the error doesn't help too much, any advice please?

Error: Error: Unexpected value 'undefined' imported by the module 'AppModule'
at new BaseException (http://localhost:5555/node_modules/@angular/compiler/bundles/compiler.umd.js:5116:27)
at eval (http://localhost:5555/node_modules/@angular/compiler/bundles/compiler.umd.js:13231:35)
at Array.forEach (native)
at CompileMetadataResolver.getNgModuleMetadata (http://localhost:5555/node_modules/@angular/compiler/bundles/compiler.umd.js:13215:48)
at RuntimeCompiler._compileComponents (http://localhost:5555/node_modules/@angular/compiler/bundles/compiler.umd.js:15845:51)
at RuntimeCompiler._compileModuleAndComponents (http://localhost:5555/node_modules/@angular/compiler/bundles/compiler.umd.js:15769:41)
at RuntimeCompiler.compileModuleAsync (http://localhost:5555/node_modules/@angular/compiler/bundles/compiler.umd.js:15746:25)
at PlatformRef_._bootstrapModuleWithZone (http://localhost:5555/node_modules/@angular/core/bundles/core.umd.js:9991:29)
at PlatformRef_.bootstrapModule (http://localhost:5555/node_modules/@angular/core/bundles/core.umd.js:9984:25)
at Object.eval (http://localhost:5555/app/main.js:8:53)
Evaluating http://localhost:5555/app/main.js
Error loading http://localhost:5555/app/main.js "Report this error at https://github.com/mgechev/angular2-seed/issues"(anonymous function) @ contracts:142ZoneDelegate.invoke @ zone.js?1472711930202:332Zone.run @ zone.js?1472711930202:225(anonymous function) @ zone.js?1472711930202:586ZoneDelegate.invokeTask @ zone.js?1472711930202:365Zone.runTask @ zone.js?1472711930202:265drainMicroTaskQueue @ zone.js?1472711930202:491ZoneTask.invoke @ zone.js?1472711930202:435


app.module.ts:

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { APP_BASE_HREF } from '@angular/common';
import { RouterModule } from '@angular/router';
import { HttpModule } from '@angular/http';
import { AppComponent } from './app.component';
import { routes } from './app.routes';

import { provide } from '@angular/core';

//dgf ng2-translate
import { TRANSLATE_PROVIDERS, TranslateLoader, TranslateStaticLoader, MissingTranslationHandler } from 'ng2-translate/ng2-translate';
import { HTTP_PROVIDERS, Http } from '@angular/http';
import { FormsModule,ReactiveFormsModule } from '@angular/forms';
import { TranslationNotFoundHandler } from './shared/common/TranslationNotFoundHandler';
//dgf ng2-translate END

import {CalendarModule,DataTableModule,DialogModule,PanelModule} from 'primeng/primeng';

import {TranslateModule} from 'ng2-translate/ng2-translate';

import { AuthGuard,AppConfigService,AppConfig,DateHelper,ThemeComponent,ToolbarComponent, RemoveHostTagDirective } from './index';
import { HomeComponent,MessagesExampleComponent,PrimeNgHomeComponent,CalendarComponent,Ng2BootstrapExamplesComponent,DatepickerDemoComponent,UserListComponent,UserEditComponent,ContractListComponent,AboutComponent } from './index';


@NgModule({
imports: [BrowserModule, HttpModule, RouterModule.forRoot(routes), /* AboutModule, HomeModule, SharedModule.forRoot()*/
FormsModule,
ReactiveFormsModule,
//third-party
,TranslateModule.forRoot() //,
//third-party PRIMENG
,CalendarModule,DataTableModule,DialogModule,PanelModule
],
declarations: [
AppComponent,ThemeComponent, ToolbarComponent, RemoveHostTagDirective,
HomeComponent,MessagesExampleComponent,PrimeNgHomeComponent,CalendarComponent,Ng2BootstrapExamplesComponent,DatepickerDemoComponent,UserListComponent,UserEditComponent,ContractListComponent,AboutComponent
],
providers: [{
provide: APP_BASE_HREF,
useValue: '<%= APP_BASE %>'
},
FormsModule,
ReactiveFormsModule,
provide(TranslateLoader, { //DGF ng2-translate
useFactory: (http: Http) => new TranslateStaticLoader(http, 'assets/i18n', '.json'),
deps: [Http]
}),
provide(MissingTranslationHandler, { useClass: TranslationNotFoundHandler }), //DGF ng2-translate

AuthGuard,AppConfigService,AppConfig,
DateHelper
],
bootstrap: [AppComponent]
})

export class AppModule { }

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