when i run the project i have following error

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Could not load file or assembly 'System.Web.Abstractions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'

when i run and in login enter the username and password and run the aspx page i have above error

what to do.

webconfig code as follows.

XML

<compilation debug="true">
        <assemblies>
            <add assembly="System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
            <add assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
            <add assembly="System.Xml.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
            <add assembly="System.Data.DataSetExtensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
            <add assembly="System.Web.Abstractions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
    <add assembly="System.Web.Routing,Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
            <add assembly="System.Data.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
            <add assembly="System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
            <add assembly="System.Data.Services.Client, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
            <add assembly="System.Data.Services.Design, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
            <add assembly="System.Data.Entity, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
            <add assembly="System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
            <add assembly="Microsoft.Office.Interop.Excel, Version=12.0.0.0, Culture=neutral, PublicKeyToken=71E9BCE111E9429C"/>
            <add assembly="System.Web.Extensions.Design, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
        </assemblies></compilation>

Posted 21-Dec-12 17:49pm

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Dominic Abraham 22-Dec-12 0:01am

Did you refer the dll "System.Web.Abstractions" ?

2 solutions

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Krunal Rohit · Answer 1 · 2012-12-21T17:56:00

Solution 1

See this :
http://forums.asp.net/t/1271268.aspx/1[^]

http://our.umbraco.org/forum/getting-started/installing-umbraco/10878--Could-not-load-file-or-assembly-'SystemWebAbstractions,-Version=3500,-Culture=neutral,-PublicKeyToken=31bf3856ad364e35'-[^]

Posted 21-Dec-12 17:56pm

Krunal Rohit

Arun kumar Gauttam · Answer 2 · 2012-12-21T18:09:00

<add assembly="System.Web.Abstractions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>

Remove this file in web config;

I face the same problem in my project,
then i remove only one file in web config and my project work well,

I am not sure in your condition but i think it work..............