IIS 7.5网站读取错误的web.config

Question

我在默认网站下的IIS上运行了2个项目，项目A＆amp; B.他们有两种不同的物理路径。

当我尝试运行项目A时，我收到此错误：

Compilation Error

Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately. 

Compiler Error Message: CS0234: The type or namespace name 'Helpers' does not exist in the namespace 'System.Web' (are you missing an assembly reference?)

Source Error:

Line 27:     <pages>
Line 28:       <namespaces>
Line 29:         <add namespace="System.Web.Helpers" />
Line 30:         <add namespace="System.Web.Mvc" />
Line 31:         <add namespace="System.Web.Mvc.Ajax" />

Source File: c:\inetpub\wwwroot\B\EnrollmentPortal\Web.config    Line: 29 

项目A试图读取项目B的web.config。这怎么可能？我找不到从项目A到项目B的任何路径，也没有在IIS中设置指定web.config路径的设置。

我该如何解决这个问题？