IIS7 deployment – duplicate ‘system.web.extensions/scripting/scriptResourceHandler’ section

On attempting to deploy a .net 3.5 website on the default app pool in IIS7 having the framework section set to 4.0, I get the following error.

There is a duplicate
‘system.web.extensions/scripting/scriptResourceHandler’ section

Commenting off the offending lines didn’t help either. Any pointers on what I need to do or look at?

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