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我收到以下錯誤，它將我的代碼部署到生產服務器中。代碼在開發中工作正常。將asp.net文件部署到iis服務器後發生配置錯誤
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
請指點！