vs2015 添加web窗体出错

Could not load file or assembly 'Microsoft.VisualStudio.JSLS,Version=14.0.0.0 , Culture=neutral , PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies.the system can not find the file specified.

1.以管理员身份打开命令提示符。
2. CD 到 C：Program Files （x86）Microsoft Visual Studio 14.0Common7IDE
3.运行 devenv /updateconfiguration
4。运行 devenv /clearcache