Description An error occurred during the processing of configuration f

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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. (c:\inetpub\wwwroot\custom\yuri\secondajaxapp_cascadingdropdown\web.config line 38)
Source Error:
Line 36: </httpHandlers>
Line 37: <httpModules>
Line 38: <add name="ScriptModule" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
Line 39: </httpModules>
Line 40: </system.web>
Source File: c:\inetpub\wwwroot\custom\yuri\secondajaxapp_cascadingdropdown\web.config Line: 38
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Version Information: Microsoft .NET Framework Version:2.0.50727.1433; ASP.NET Version:2.0.50727.1433