如何解决“在未引用的程序集中定义了'System.Object'类型”

Question

我不知道为什么会收到此错误。我看过标题相似的问题，但似乎都无济于事。

web.config

  <dependentAssembly>
    <assemblyIdentity name="System.Web.Razor" publicKeyToken="31BF3856AD364E35" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
  </dependentAssembly>
  <dependentAssembly>
    <assemblyIdentity name="System.Web.WebPages.Razor" publicKeyToken="31BF3856AD364E35" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
  </dependentAssembly>
  <dependentAssembly>
    <assemblyIdentity name="System.Web.Optimization" publicKeyToken="31bf3856ad364e35" />
    <bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="1.1.0.0" />
  </dependentAssembly>
  <dependentAssembly>
    <assemblyIdentity name="WebGrease" publicKeyToken="31bf3856ad364e35" />
    <bindingRedirect oldVersion="0.0.0.0-1.6.5135.21930" newVersion="1.6.5135.21930" />
  </dependentAssembly>

尝试：

1. 删除.vs文件夹并重建
2. 更改端口号