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我收到以下错误，它将我的代码部署到生产服务器中。代码在开发中工作正常。将asp.net文件部署到iis服务器后发生配置错误
Configuration 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=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified. (E:\QA\form\web.config line 103)
Source Error:
Line 101: </httpHandlers>
Line 102: <httpModules>
Line 103: <add name="ScriptModule" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
Line 104: </httpModules>
Line 105: </system.web>
Source File: E:\QA\form\web.config Line: 103
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Version Information: Microsoft .NET Framework Version:2.0.50727.3053; ASP.NET Version:2.0.50727.3053
请指点！