ReportServer and missing System.XML

Server Error in '/ReportServer' Application.
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 'Xml' does not
exist in the namespace 'System' (are you missing an assembly reference?)

Source Error:
Line 2: <%@ Import Namespace="System.IO" %>
Line 3: <%@ Import Namespace="System.Xml.Serialization" %>
Line 4: <%@ Import Namespace="System.Xml" %>
Line 5: <%@ Import Namespace="System.Xml.Schema" %>
Line 6: <%@ Import Namespace="System.Web.Services" %>

Source File:
c:\WINDOWS\Microsoft.NET\Framework\v2.0.50215\CONFIG\DefaultWsdlHelpGenerator.aspx
Line: 4

Show Detailed Compiler Output:
c:\windows\system32\inetsrv>
"C:\WINDOWS\Microsoft.NET\Framework\v2.0.50215\csc.exe" /t:library
/utf8output
/R:"C:\WINDOWS\assembly\GAC_32\System.Web\2.0.0.0__b03f5f7f11d50a3a\System.Web.dll"
/R:"C:\WINDOWS\assembly\GAC_MSIL\System\2.0.0.0__b77a5c561934e089\System.dll"
/R:"C:\WINDOWS\Microsoft.NET\Framework\v2.0.50215\Temporary ASP.NET
Files\reportserver\55a9c3a5\2dd8b450\App_global.asax.zqf6hd1z.DLL"
/R:"C:\WINDOWS\Microsoft.NET\Framework\v2.0.50215\Temporary ASP.NET
Files\reportserver\55a9c3a5\2dd8b450\assembly\dl3\350030b5\8089eb72_de3dc501\ReportingServicesWebServer.DLL"
/out:"C:\WINDOWS\Microsoft.NET\Framework\v2.0.50215\Temporary ASP.NET
Files\reportserver\55a9c3a5\2dd8b450\App_Web_defaultwsdlhelpgenerator.aspx.cdcab7d2.cb8rx9zv.dll"
/debug- /optimize+ /w:4 /nowarn:1659;1699
"C:\WINDOWS\Microsoft.NET\Framework\v2.0.50215\Temporary ASP.NET
Files\reportserver\55a9c3a5\2dd8b450\gmg4atn0.0.cs"
"C:\WINDOWS\Microsoft.NET\Framework\v2.0.50215\Temporary ASP.NET
Files\reportserver\55a9c3a5\2dd8b450\gmg4atn0.1.cs"
Microsoft (R) Visual C# 2005 Compiler version 8.00.50215.44
for Microsoft (R) Windows (R) 2005 Framework version 2.0.50215
Copyright (C) Microsoft Corporation 2001-2005. All rights reserved.

c:\WINDOWS\Microsoft.NET\Framework\v2.0.50215\CONFIG\DefaultWsdlHelpGenerator.aspx(4,18):
error CS0234: The type or namespace name 'Xml' does not exist in the
namespace 'System' (are you missing an assembly reference?)
c:\WINDOWS\Microsoft.NET\Framework\v2.0.50215\CONFIG\DefaultWsdlHelpGenerator.aspx(7,22):
error CS0234: The type or namespace name 'Services' does not exist in the
namespace 'System.Web' (are you missing an assembly reference?)
c:\WINDOWS\Microsoft.NET\Framework\v2.0.50215\CONFIG\DefaultWsdlHelpGenerator.aspx(5,18):
error CS0234: The type or namespace name 'Xml' does not exist in the
namespace 'System' (are you missing an assembly reference?)
c:\WINDOWS\Microsoft.NET\Framework\v2.0.50215\CONFIG\DefaultWsdlHelpGenerator.aspx(6,22):
error CS0234: The type or namespace name 'Services' does not exist in the
namespace 'System.Web' (are you missing an assembly reference?)
c:\WINDOWS\Microsoft.NET\Framework\v2.0.50215\CONFIG\DefaultWsdlHelpGenerator.aspx(8,22):
error CS0234: The type or namespace name 'Services' does not exist in the
namespace 'System.Web' (are you missing an assembly reference?)

and etc.

Does anyone have a clue what is happening and how it can be fixed?

Thanks,

--
Martin Kulov
http://www.codeattest.com/blogs/martin

MCAD Charter Member
MCSD.NET Early Achiever
MCSD

[4395 byte] By [MartinKulov] at [2008-2-6]