C# 类型或命名空间名称'；Http'；命名空间中不存在'；System.Web'；

我的Asp.net MVC操作返回一个视图。操作没有错误，但是当视图在编译阶段出现此错误时。我不知道这个System.Web.Http.Data.Helpers来自哪里。我从这个动作中添加了一个全新的空MVC视图。它也犯了同样的错误。此应用程序使用MVC 5.2.3.0和.NET Framework 4.5.2。有人知道问题出在哪里吗？多谢各位

编译错误
描述：编译服务此请求所需的资源时出错。请查看以下特定错误详细信息，并适当修改源代码。
编译器错误消息：CS0234:命名空间“System.Web”中不存在类型或命名空间名称“Http”（是否缺少程序集引用？）
源错误：
第26行：使用System.Web.Optimization；
第27行：使用System.Web.Routing；
第28行：使用System.Web.Http.Data.Helpers；
第29行：
第30行：
源文件：c:\Users\myNetworkAccount\AppData\Local\Temp\1\Temporary ASP.NET Files\vs\cdda6d1e\b9ef792f\App\u Web\u accessrequest.cshtml.f4cc22dc.wyu-er3-.0.cs行：28
显示详细的编译器输出：
C:\Program Files（x86）\IIS Express>“C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe”/t:library/utf8output/R:“C:\Windows\Microsoft.NET\assembly\GAC\U MSIL\System.ServiceModel\v4.0.0\UuU b77a5c561934e089\System.ServiceModel.dll”/R:“C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.IdentityModel\v4.0.0.0_uuuB77A5C561934E089\System.IdentityModel.dll”/R:“C:\WINDOWS\assembly\GAC_MSIL\Microsoft.ReportViewer.WinForms\10.0.0_uuB03F5F7F11D50A3A\Microsoft.ReportViewer.WinForms.dll”/R:”C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\Microsoft.CSharp\v4.0.0.0_uuuB03F5F7F11D50A3a\Microsoft.CSharp.dll”/R:“C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.ServiceModel.Activities\v4.0.0\uuu 31bf3856ad364e35\System.ServiceModel.Activities.dll”/R:”C:\WINDOWS\assembly\GAC\MSIL\Microsoft.ReportViewer.DataVisualization\12.0.0\U845DCD8080CC91\Microsoft.ReportViewer.DataVisualization.dll”/R:“C:\Users\myNetworkAccount\AppData\Local\Temp\1\Temporary ASP.NET Files\vs\cdda6d1e\b9ef792f\assembly\dl3\17f2d89a\005843ef\e538d201\System.Spatial.dll”/R:”C:\WINDOWS\Microsoft.Net\assembly\GAC\U MSIL\System.Web.ApplicationServices\v4.0\U 4.0.0.0\UUU 31bf3856ad364e35\System.Web.ApplicationServices.dll”/R:“C:\WINDOWS\Microsoft.Net\assembly\GAC\U MSIL\System.Data.DataSetExtensions\v4.0.0.0\UUUU B77A561934E089\System.Data.DataSetExtensions.dll”/R:“C:\Users\myNetworkAccount\AppData\Local\Temp\1\Temporary ASP.NET Files\vs\cdda6d1e\b9ef792f\assembly\dl3\f90554c5\0033c11d\U e638d201\Microsoft.Data.Services.Client.dll”/R:“C:\Users\myNetworkAccount\AppData\Local\Temp\1\Temporary ASP.NET Files\vs\cdda6d1e\b9ef792f\assembly\dl3\462aa9eb\00a1c9ec\U 4A3BDAJAXMIN.dll”/R:”C:\WINDOWS\Microsoft.Net\assembly\GAC\U MSIL\System.ServiceModel.Web\v4.0.0.0\Uuu 31bf3856ad364e35\System.ServiceModel.Web.dll”/R:“C:\WINDOWS\Microsoft.Net\assembly\GAC\U MSIL\Microsoft.VisualStudio.Web.PageInspector.Loader\v4.0\U 1.0.0\Uuu b03f5f7f11d50a3a\Microsoft.VisualStudio.Web.PageInspector.Loader.dll”/R:”C:\Users\myNetworkAccount\AppData\Local\Temp\1\Temporary ASP.NET Files\vs\cdda6d1e\b9ef792f\assembly\dl3\76c1f975\00d3e643\U e638d201\Microsoft.Data.Edm.dll”/R:“C:\Users\myNetworkAccount\AppData\Local\Temp\1\Temporary ASP.NET Files\vs\cdda6d1e\b9ef792f\assembly\dl3\a4d0f7a8\00d9ab6a\b76bd201\Microsoft.WindowsAzure.Storage.dll”/R:”C:\WINDOWS\Microsoft.Net\assembly\GAC\U MSIL\System.Web.WebPages.Deployment\v4.0\U 2.0.0\UUU 31bf3856ad364e35\System.Web.WebPages.Deployment.dll”/R:“C:\WINDOWS\Microsoft.Net\assembly\GAC\U MSIL\System.Xml.Linq\v4.0.0.0\UUU B77A561934E089\System.Xml.Linq.dll”/R:”C:\Users\myNetworkAccount\AppData\Local\Temp\1\Temporary ASP.NET Files\vs\cdda6d1e\b9ef792f\assembly\dl3\b3845a67\007c06f2\u e72ed201\Microsoft.WindowsAzure.Configuration.dll”/R:“C:\WINDOWS\Microsoft.NET\assembly\GAC\u MSIL\System.Web.dynamicata\v4.0\u 4.0.0.0\u31bf3856ad364e35\System.Web.dynamicata.dll”/R:”C:\WINDOWS\Microsoft.Net\assembly\GAC\U MSIL\System.ServiceModel.Activation\v4.0\U 4.0.0.0\UU 31bf3856ad364e35\System.ServiceModel.Activation.dll”/R:“C:\WINDOWS\Microsoft.Net\assembly\GAC\U MSIL\System.Web.Services\v4.0.0\UU b03f5f7f11d50a3a\System.Web.Services.dll”/R:”C:\WINDOWS\Microsoft.Net\assembly\GAC\U MSIL\System\v4.0.0.0\UUU b77a5c561934e089\System.dll”/R:“C:\WINDOWS\Microsoft.Net\assembly\GAC\U 32\System.Web\v4.0\U 4.0.0\UUU b03f5f7f11d50a3a\System.Web.dll”/R:“C:\WINDOWS\assembly\GAC\MSIL\Microsoft.SqlServer.Types\12.0.0.0.0.0\DC895DC80CC91\SQLR:”C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Runtime.Serialization\v4.0.0.0_uuuB77A5C561934E089\System.Runtime.Serialization.dll”/R:“C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Web.Extensions\v4.0.0.0_uu31BF3856AD364E35\System.Web.Extensions.dll”/R:”C:\Users\myNetworkAccount\AppData\Local\Temp\1\Temporary ASP.NET Files\vs\cdda6d1e\b9ef792f\assembly\dl3\f20c5ade\00a06763\U c729cf01\itextsharp.dll”/R:“C:\WINDOWS\assembly\GAC\U MSIL\Microsoft.ReportViewer.Common\10.0.0.0\UU b03f5f7f11d50a3a\Microsoft.ReportViewer.Common.dll”/R:”C:\Users\myNetworkAccount\AppData\Local\Temp\1\Temporary ASP.NET Files\vs\cdda6d1e\b9ef792f\assembly\dl3\016d1299\007175d9\U 0e55d001\EntityFramework.dll”/R:“C:\WINDOWS\Microsoft.NET\assembly\GAC_MSIL\System.WorkflowServices\v4.0.0.0\U31BF3856AD364E35\System.FlowServices.dll”/R:”C:\Users\myNetworkAccount\AppData\Local\Temp\1\Temporary ASP.NET Files\vs\cdda6d1e\b9ef792f\assembly\dl3\d7846dc9\007175d9\U 0e55d001\EntityFramework.SqlServer.dll”/R:“C:\WINDOWS\Microsoft.NET\assembly\GAC\U 32\System.EnterpriseServices\v4.0.0.0.0\UU B03F57F11D50A3A\System.EnterpriseServices.dll”/R:”C:\Users\myNetworkAccount\AppData\Local\Temp\1\Temporary ASP.NET Files\vs\cdda6d1e\b9ef792f\App\u global.asax.vinu2f-w.dll”/R:“C:\Users\myNetworkAccount\AppData\L