请问我在运行的时候出现下面的提示，不知道哪里出了问题：
“/shop”应用程序中的服务器错误。
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找不到文件或程序集名称“System”，或找不到它的一个依赖项。
说明: 执行当前 Web 请求期间，出现未处理的异常。请检查堆栈跟踪信息，以了解有关该错误以及代码中导致错误的出处的详细信息。
异常详细信息: System.IO.FileNotFoundException: 找不到文件或程序集名称“System”，或找不到它的一个依赖项。
源错误:
行 30： private static bool __intialized = false;
行 31：
行 32： public Global_asax() {
行 33： if ((ASP.Global_asax.__intialized == false)) {
行 34： ASP.Global_asax.__intialized = true;
源文件: C:\WINDOWS\Microsoft.NET\Framework\v1.0.3705\Temporary ASP.NET Files\shop\da252244\57f0106b\wvewzrp9.0.cs 行: 32
程序集加载跟踪: 下列信息有助于确定程序集“System”无法加载的原因。
=== Pre-bind state information ===
LOG: DisplayName = System, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
(Fully-specified)
LOG: Appbase = file:///E:/免费网站/免费网店DSFree/DSFree
LOG: Initial PrivatePath = bin
Calling assembly : DreamerShop, Version=2.1.0.0, Culture=neutral, PublicKeyToken=null.
===
LOG: Publisher policy file is not found.
LOG: No redirect found in host configuration file (C:\WINDOWS\Microsoft.NET\Framework\v1.0.3705\aspnet.config).
LOG: Using machine configuration file from C:\WINDOWS\Microsoft.NET\Framework\v1.0.3705\config\machine.config.
LOG: Post-policy reference: System, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
LOG: Attempting download of new URL file:///C:/WINDOWS/Microsoft.NET/Framework/v1.0.3705/Temporary ASP.NET Files/shop/da252244/57f0106b/System.DLL.
LOG: Attempting download of new URL file:///C:/WINDOWS/Microsoft.NET/Framework/v1.0.3705/Temporary ASP.NET Files/shop/da252244/57f0106b/System/System.DLL.
LOG: Attempting download of new URL file:///E:/免费网站/免费网店DSFree/DSFree/bin/System.DLL.
LOG: Attempting download of new URL file:///E:/免费网站/免费网店DSFree/DSFree/bin/System/System.DLL.
LOG: Attempting download of new URL file:///C:/WINDOWS/Microsoft.NET/Framework/v1.0.3705/Temporary ASP.NET Files/shop/da252244/57f0106b/System.EXE.
LOG: Attempting download of new URL file:///C:/WINDOWS/Microsoft.NET/Framework/v1.0.3705/Temporary ASP.NET Files/shop/da252244/57f0106b/System/System.EXE.
LOG: Attempting download of new URL file:///E:/免费网站/免费网店DSFree/DSFree/bin/System.EXE.
LOG: Attempting download of new URL file:///E:/免费网站/免费网店DSFree/DSFree/bin/System/System.EXE.
堆栈跟踪:
[FileNotFoundException: 找不到文件或程序集名称“System”，或找不到它的一个依赖项。]
DreamerShop.Global..ctor() +0
ASP.Global_asax..ctor() in C:\WINDOWS\Microsoft.NET\Framework\v1.0.3705\Temporary ASP.NET Files\shop\da252244\57f0106b\wvewzrp9.0.cs:32
[TargetInvocationException: 调用的目标发生了异常。]
System.RuntimeType.CreateInstanceImpl(Boolean publicOnly) +0
System.Activator.CreateInstance(Type type, Boolean nonPublic) +66
System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes) +277
System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes) +109
System.Web.HttpApplicationFactory.GetSpecialApplicationInstance() +160
System.Web.HttpApplicationFactory.FireApplicationOnStart(HttpContext context) +20
System.Web.HttpApplicationFactory.Init(HttpContext context) +481
System.Web.HttpApplicationFactory.GetApplicationInstance(HttpContext context) +155
System.Web.HttpRuntime.ProcessRequestInternal(HttpWorkerRequest wr) +407
