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

user_401507 0
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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 suddenly i got that series of errors when i run my website

Microsoft JScript runtime error: ASP.NET Ajax client-side framework failed to load.

Microsoft JScript runtime error: 'Sys' is undefined

The strange things is that i made a website on the same machine with VS 2010 and the update panels there work perfectly.i took its web.config to my new website and changed just the connection..and i got the same error

I tried to search for a solution but i failed to find any real solution.Can anyone help?

.net-4.0 asp.net ajax
13 Answers

if you using URL rewrite module, then in each rewrite rule add

<add input="{URL}" pattern="\.axd$" negate="true"/>

under conditions tag, like this:

<rule name="HomeRewrite" stopProcessing="true">
   <match url="^home$"/>
   <conditions>
     <add input="{URL}" pattern="\.axd$" negate="true"/>
   </conditions>
   <action type="Rewrite" url="/home.aspx"/>
</rule>
user_6908730
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