HTTP Error 500.19 - Internal Server Error

The requested page cannot be accessed because the related configuration data for the page is invalid.

Detailed Error Information:

Module   RequestFilteringModule
Notification   BeginRequest
Handler   StaticFile
Error Code   0x800700b7
Config Error   Cannot add duplicate collection entry of type 'add' with unique key attribute 'fileExtension' set to '.php'
Config File   \\?\D:\web\kappel.com.au\office\web.config
Requested URL   https://kappel.com.au:443/office/docs/product-images/lhhc_lawson_white_euro_h1.jpg
Physical Path   D:\web\kappel.com.au\office\docs\product-images\lhhc_lawson_white_euro_h1.jpg
Logon Method   Not yet determined
Logon User   Not yet determined

Config Source:

   21:                 <fileExtensions>
   22:                     <add fileExtension=".php" allowed="false" />
   23:                 </fileExtensions>

More Information:

This error occurs when there is a problem reading the configuration file for the Web server or Web application. In some cases, the event logs may contain more information about what caused this error.

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