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Monday, 16 August 2010

Ajax Control Toolkit 3.5 : The script 'Timer.js' has been referenced multiple times.

Developed a website using Fast ASP.NET Web page loading by downloading multiple JavaScripts after visible content and in batch using .NET 2.0, Ajax 1.0 and Ajax Control toolkit. After migrated to .NET 3.5 getting the following error:-

"Microsoft JScript runtime error: Sys.InvalidOperationException: The script 'Timer.js' has been referenced multiple times. If referencing Microsoft AJAX scripts explicitly, set the MicrosoftAjaxMode property of the ScriptManager to Explicit."

As per the methodology used to delay loading of JavaScripts after visible content, all resource files(.axd) should be included in Filesets.xml.

Now find out where the error has occured in the script reference for eg:

comment out the script resource in the xml. Timer control should not be included as part of combine scripts and hence the respective script resource should be commented.

Also to view any resource file that has been included in the xml just open the resource in Visual Studio (File -> Open when website is running) . for eg: if the location is


the url for this would be


Computers can figure out all kinds of problems, except the things in the world that just don't add up.
James Magary


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