There is a duplicate 'system.web.extensions/scripting/scriptResourceHandler

Created:

2016-12-18 23:59:10 UTC

Modified:

2017-08-08 13:46:25 UTC

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There is a duplicate 'system.web.extensions/scripting/scriptResourceHandler

Issue Symptoms

Unable to open the website in web browser, the following error occurs:

There is a duplicate 'system.web.extensions/scripting/scriptResourceHandler

Cause

Website' application developed for ASP.NET 2.0, but application pool is running on ASP.NET 4.0.

Resolution

This is a known issue in ASP.NET. Switch website to application pool running on .NET Framework 4.0

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