Microsoft JScript runtime error: Sys.InvalidOperationException: TypeSys.UI._Timer has already been registered

I am getting this error every time I run the page. What could be wrong?

Microsoft JScript runtime error: Sys.InvalidOperationException: TypeSys.UI._Timer has already been registered.

Please let me know.

Answer

It’s a confirmed bug that will be fixed in the next release. Basically, it has to do with how the PageRequestManager detects which scripts have already been loaded on the page

see this link

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