There is a duplicate ‘system.web.extensions|scripting|scriptResourceHandler’ section defined IIS Fix

IIS not working after upgrade to Windows 10 Pro from Windows 7.
HTTP Error 500.19 error when you open an IIS Webpage.
The error occurs because system.web.extensions sections are defined in both site-level and application level web.configs.
This can happen with applications developed for ASP.NET 2.0 when ASP.NET 4.0 is set as default.

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