I have same error,
I try remove and add it again but not success.
And when I browse a page in IIS Manager I got this error
Description: An
error occurred during the processing of a configuration file required
to service this request. Please review the specific error details below
and modify your configuration file appropriately.
Parser Error Message: Could
not load file or assembly 'System.Web.Extensions, Version=1.0.61025.0,
Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its
dependencies. The system cannot find the file specified.
Source Error:
Line 37: <compilation debug="true"> Line 38: <assemblies> Line 39: <add assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/> Line 40: <add assembly="System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/> Line 41: <add assembly="System.Web.Extensions.Design, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
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Source File: E:\Source\eCommerce\Web\web.config Line: 39