Ajax client-side framework failed to load Asp.Net 4.0

Question

I got a complicated problem with ASP.Net 4.0 Ajax....I started a website with Visual Studio 2010 on my machine,and added some update panels they used to work fine,but sudden

Answer 1

This is a common error that happens when you try to call framework javascript function before page have even loaded them.

So ether run your code when dom is ready (eg pageload), ether place your code after the scriptmanager tag, or check to place it after the javascript load from scriptmanager.