Cannot resolve all parameters for 'Storage'(?, ?). Make sure that all the parameters are decorated with Inject or have valid type annotations and that 'Storage' is decorated with Injectable

@neozhu wrote:

`import {Storage,SqlStorage} from 'ionic-angular';
import {Injectable} from 'angular2/core';
import {Contact} from '../modules/Contact';

@Injectable()
export class DataService{
  private data:Array<Contact>;
  private storage:Storage;
  constructor(){
    this.storage=new Storage(SqlStorage,{name:'contact-app'});
    this.data=null;
    this.storage.get('contact-app').then((contacts)=>{
      this.data=JSON.parse(contacts);
    })
  }
  getData(){
    return this.storage.get('contact-app');
  }
  save(item){
    if(!this.data){
      this.data=[item];
      let newData=JSON.stringify(item);
      this.storage.set('contact-app',newData);
    }else{
      this.data.push(item);
      let newData=JSON.stringify(this.data);
      this.storage.set('contact-app',newData);
    }
  }

}`

error
app.bundle.js:17029Uncaught TypeError: Cannot read property 'getOptional' of undefined
exports.PlatformRef_ = PlatformRef_;
function _runAppInitializers(injector) {
var inits = injector.getOptional(application_tokens_1.APP_INITIALIZER);

bug?

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