I can't get rid of this error during runtime

Server Error in '/' Application.

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Compilation Error

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Microsoft (R) Visual C# 2008 Compiler version 3.5.21022.8
for Microsoft (R) .NET Framework version 3.5
Copyright (C) Microsoft Corporation. All rights reserved.

c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\root\5b76b49d\973a2fa7\assembly\dl3\4171d944\f4328ec6_34c1c801\MvcValidatorToolkit.DLL: error CS1705: Assembly 'MvcValidatorToolkit, Version=1.0.0.30828, Culture=neutral, PublicKeyToken=null' uses 'System.Web.Extensions, Version=3.6.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' which has a higher version than referenced assembly 'System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'
c:\WINDOWS\assembly\GAC_MSIL\System.Web.Extensions\3.5.0.0__31bf3856ad364e35\System.Web.Extensions.dll: (Location of symbol related to previous error)
c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\root\5b76b49d\973a2fa7\assembly\dl3\4171d944\f4328ec6_34c1c801\MvcValidatorToolkit.DLL: warning CS1684: Reference to type 'System.Web.Mvc.Controller' claims it is defined in 'c:\WINDOWS\assembly\GAC_MSIL\System.Web.Extensions\3.5.0.0__31bf3856ad364e35\System.Web.Extensions.dll', but it could not be found
c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\root\5b76b49d\973a2fa7\assembly\dl3\4171d944\f4328ec6_34c1c801\MvcValidatorToolkit.DLL: warning CS1684: Reference to type 'System.Web.Mvc.ViewPage' claims it is defined in 'c:\WINDOWS\assembly\GAC_MSIL\System.Web.Extensions\3.5.0.0__31bf3856ad364e35\System.Web.Extensions.dll', but it could not be found

The first error message is about System.Web.Extensions Version=3.6.0.0 which was part of the MVC Preview 1 code.  Do you have an old version of MvcValidatorToolkit hanging around.

It looks like there is an updated version of MvcValidatorToolkit at www.codeplex.com/MvcValidatorToolkit which has been built to work with the Preview 2 bits.

 I can't find where v3.6 is being referenced.  In our web.config it's just referring to v3.5.

 So looks lke we're using the new validation toolkit assembly but our references are looking for the first version instead?

Try removing the reference in the project to the Validator Toolkit and then readding it, just to be sure that you are referencing the version that you think you are.  (Not in web.config but in the project references area)

I just downloaded the MvcValidatorToolkit but it would not build because of old references to the Mvc bits.  I removed the references from within the MvcValidatorToolkit project and then added the correct references to System.Web.Abstractions, System.Web.Mvcand System.Web.Routing and everything then built OK.  So, it might be a good idea to double chekc the references within your copy of the Toolkit and force it to rebuild.

Good luck

 >>Try removing the reference in the project to the Validator Toolkit and then readding it

 did that.   In fact we aren't using it anymore so completely removing it also does not get rid of this error message.

 >>>I just downloaded the MvcValidatorToolkit but it would not build because of old references to the Mvc bits.  I removed the references from within the MvcValidatorToolkit project and then added the correct references to System.Web.Abstractions, System.Web.Mvcand System.Web.Routing and everything then built OK.  So, it might be a good idea to double chekc the references within your copy of the Toolkit and force it to rebuild.

We aren't using the toolkit...and there was only one reference which I removed from one of our projects in the solution.  So not sure what else to try here.  Cleaned my temp asp.net files also.

Hmmm,  an error in an assembly that is not present???  Have you tried deleting the entire contents of the bin folder?

If that fails, look around the room to see if anyone is smiling, maybe someone is plaing tricks on you !

As a wise man once said "Just because you are paranoid does not mean they are not out to get you"

 it's funny you say that because it relates to things that have happened lately with this team and their attitude towards me professionally.

 Hey thanks.  Yea, deleting all the references in my web app's bin folder did the trick!