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You can find a lot of debugging and deploying problems while developing applications in .NET and Visual Basic here. There are also some querying tips in SQL and typical source codes which might be useful shared here.

Cannot Display Web Page on IIS due to Configuration Error

Error:

HTTP Error 500.19 - Internal Server Error

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

Config Error: There is a duplicate 'system.web.extensions/scripting/scriptResourceHandler' section defined
Config File:  Application\Web\web.config

The error on IIS 7.5 should look like this.


Solution:
Open web.config, and then comment out the "system.web.extensions" sectionGroup under configSections tag.
For example:
<!--<sectiongroup name="system.web.extensions">
............
............
...........
</sectiongroup>-->
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