Want to use Visual Studio 2010 with older framework components but getting GAC errors

Im trying to work on a web application built using .net 3.5/vs 2008 with VS 2010 but when I compile the project I get the following:

Error      1      The type 'System.Web.Compilation.WCFBuildProvider' is ambiguous: it could come from assembly 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Web.Extensions\v4.0_4.0.0.0__31bf3856ad364e35\System.Web.Extensions.dll' or from assembly 'C:\Windows\assembly\GAC_MSIL\System.Web.Extensions\3.5.0.0__31bf3856ad364e35\System.Web.Extensions.dll'. Please specify the assembly explicitly in the type name.      App_WebReferences/      


I dont know how to get this sorted out.
rochestermnAsked:
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Jaime OlivaresConnect With a Mentor Software ArchitectCommented:
I would suggest to delete the reference and re-add, taking care of the version.
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käµfm³d 👽Commented:
This is saying there are two DLLs with the same name--one for framework version 3.5 and one for 4.0. The compiler is seeing both right now and can't tell which one you want to use. You must instruct the compiler which you would like. Expand the references section of Solution Explorer and make sure you don't have have the System.Web.Extensions.dll listed twice.
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DanSo1Commented:
Try to set: Properties -> Specific Version -> True
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avanceconsultingCommented:
1: there are no multiple references - this solution is not working
2: Try to set: Properties -> Specific Version -> True :  for this reference the specific version attribute is not comming..so unable to set this property
3: I've tried to re-add the reference by deleting..even this one laso not working

the original issue is
Error      258      The type 'System.Web.Compilation.WCFBuildProvider' is ambiguous: it could come from assembly 'C:\Windows\assembly\GAC_MSIL\System.Web.Extensions\3.5.0.0__31bf3856ad364e35\System.Web.Extensions.dll' or from assembly 'C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Web.Extensions\v4.0_4.0.0.0__31bf3856ad364e35\System.Web.Extensions.dll'. Please specify the assembly explicitly in the type name.      App_WebReferences/      
...please give me the solution...this issue was came when i've converted vs2008 solution to 2010...Please give me the answer as soon as possible
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