在角度2生产模式下找不到模块？

Question

当我构建作品时，我收到以下错误

  

39％建筑模块244/473模块229有效   ... de_modules / rxjs / operator / toPromise.jsModuleNotFoundError：Module   找不到

my angular 2 version

   "@angular/common": "2.4.6",
   "@angular/compiler": "2.4.6",
   "@angular/compiler-cli": "2.4.6",
   "@angular/core": "2.4.6",
   "@angular/forms": "2.4.6",
   "@angular/http": "2.4.6",
   "@angular/platform-browser": "2.4.6",
   "@angular/platform-browser-dynamic": "2.4.6",
   "@angular/platform-server": "2.4.6"

我正在使用网络包：2.1.0-beta.21

有人提出解决此错误的建议吗？