Web Forms :: "Sys" Is Undefined Error "client-side Framework Failed To Load" On Webpage

Jul 16, 2010

When I open my webpage locally on my computer, the webpage does not through any error but from the server, I get those: Message: ASP.NET Ajax client-side framework failed to load.

Message: 'Sys' is undefined
Line: 678
Message: 'Sys' is undefined
Line: 2542

In the web.config file I changed: <compilation debug="true"> to <compilation debug="false"> wich solved the first error(ASP.NET Ajax client-side framework failed to load.)

1. I wonder if that is okay to solve that error like that?
2. Then I wonder for the 'Sys' is undefined, what is causing that error. I googled and could solve the first error but this Sys error it seems to have countless of solutions that have not worked for me, so I might wonder what can cause this

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