生产构建会引发意外错误

Question

前几天我用Angular 4构建了我的Spring Boot和npm run build应用，一切正常，但现在我收到了这样的错误：

ERROR in Can't resolve all parameters for DataService in C:/Users/Michał/IdeaProjects/Inventory/src/main/frontend/src/app/services/data.service.ts: (?, [object Object]).

ERROR in ./src/main.ts
Module not found: Error: Can't resolve './$$_gendir/app/app.module.ngfactory' in 'C:\Users\Michał\IdeaProjects\Inventory\src\main\frontend\src'
 @ ./src/main.ts 3:0-74
 @ multi ./src/main.ts

我的data.service班看起来：

@Injectable()
export class DataService {
  constructor(private url: string, private http: HttpClient) { }

  getAllWithPaging(params: HttpParams){
    return this.http.get(this.url + '/withPaging?' + params.toString());
  }

  insertOrUpdate(resources){
    return this.http.post(this.url, resources);
  }

  delete(resources){
    return this.http.delete(this.url + '/' + resources.id, {responseType: 'text'});
  }

  get getUrl() : string{
    return this.url;
  }

  get getHttp(): HttpClient{
    return this.http
  }

自一周以来发生了什么变化？