File not found error in NewDwp.aspx SharePoint

Hi,

I was getting this error while trying to all a new custom web part to the site.

Searching for the same found out the reason for that

It happens when you install smart part

http://www.codeplex.com/smartpart

But haven’t installed asp.net ajax 1.0 version !

http://www.microsoft.com/downloads/details.aspx?FamilyID=ca9d90fa-e8c9-42e3-aa19-08e2c027f5d6&displaylang=en

Follow it with an iis reset !!

Bye ..