Hello,

At some time many of us have faced the error when trying to navigate the website in website panel.

Error is :

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Error: The configuration section 'system.web.extensions' cannot be read because it is missing a section declaration
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Fix :

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Please check that the dot net version of application pool is correct.
If the appplication is created under .Net4 and you have set it 3.5
you need to change it from IIS.


Regards,
Robinson