IIS7 deployment - duplicate 'system.web.extensions/scripting/scriptResourceHandler' section

Question

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 i

Answer 1

My resolution was kind of stupid.

• I installed a copy of .net 3.5

• Created another app pool and selected .net 3.5 (it says 2.0.5077 in the drop down)

• Added my website to that app pool

• Recycled the old and new pools and the site started working.

It came down to me not having 3.5 installed even though the turn on windows features said I did and creating another app pool to use. I hope this helps others.