IIS里打开aspx文件出现 Server Error in '/' Application.

IE出现内容如下:

Server Error in '/' Application.
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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 'URLRewriter' or one of its dependencies. 系统找不到指定的文件。

Source Error:

Line 143: </httpModules>
Line 144: <httpHandlers>
Line 145: <add verb="*" path="*.aspx" type="URLRewriter.RewriterFactoryHandler, URLRewriter" />
Line 146: <add verb="*" path="*.htm" type="URLRewriter.RewriterFactoryHandler, URLRewriter" />
Line 147: <add verb="POST,GET" path="ajaxpro/*.ashx"

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