angular 2 Import Custom Module returns error

Question

I'm getting this error trying to import a custom module

zone.js:269 Uncaught Error: Unexpected value '[object Object]' imported by the module 'AppModule'

this is my app.module.ts

const SELFBITSCONFIG = {...}

@NgModule({
  imports: [ 
    ...
    SelfbitsAngularModule.forRoot(SELFBITSCONFIG)
  ]
})

this is the external file i'm trying to import

@NgModule({
    providers:SELFBITS_PROVIDERS,
    imports:[HttpModule]
})

export class SelfbitsAngularModule{
    static forRoot(config:SelfbitsAppConfig):ModuleWithProviders{
        return {
            ngModule:SelfbitsAngularModule,
            providers:[
                { provide: SELFBITS_CONFIG, useValue: config }
            ]
        }
    }
}

I'm using angular 2 starter webpack by Angular Class, currently running "webpack": "2.1.0-beta.22"