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How To Fix Error Asp.net Ajax Client-side Framework Failed To Load. .net 4
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minute: Sign up ASP.NET Ajax client-side framework failed to load up vote 5 down vote favorite I got this error: ASP.NET Ajax client-side framework failed to load with the error: 'Sys' is undefined. The error qppears in IE on the
bottom (error message), and appears only when i'm running the site on server. on my localhost everything works fine. i moved for new server, and there i have the problem. in my previous server everything was fine. The problem comes from the SCRIPTMANAGER of the ajax. what i can to do? somthing in the web.config, or should the host company need to install somthing? ASP.NET 4, IIS 7.5 The ugly yellow triangle on the IE is not what is disturbing me.. the asp net ajax client side framework failed to load internet explorer big problem is that the script manager with the update pannel - dont work ! asp.net ajax scriptmanager share|improve this question edited Dec 26 '11 at 19:17 asked Dec 26 '11 at 19:08 Oshrib 33652148 Yes, nothing works. i lost myself on the searching. maybe here somone will give me the right answer. –Oshrib Dec 26 '11 at 19:14 I had these errors, too. Don't recall what the issue was, though. Checking the web.config and that your app pool actually uses .NET 4 would be a good start. –Uwe Keim Dec 26 '11 at 19:15 @UweKeim - thanks. that the first think i did :( . the ugly yellow triangle on the IE is not what is disturbing me.. the big problem is that the script manager with the update pannel - dont work ! :( –Oshrib Dec 26 '11 at 19:17 Don't blame the yellow triangle, it's innocent ;-) –Uwe Keim Dec 26 '11 at 19:19 When you use IE's debugging tools, are you able to determine if requests to ScriptResource.axd are coming back with 404 errors? This kind of error is most often caused by problems with the configuration of your site's handler mappings. –lthibodeaux Dec 26 '11 at 20:31 | show 2 more comments 5 Answers 5 active oldest votes up vote 7 down vote accepted A quick solution is to update your web.config and add following section