0x800a1391 - JavaScript runtime error: 'Sys' is undefined

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Hi Friends,
I have a website developed VS 2005 which siinto VS 2013 website.
The technologies used are Javascript,jquery,Ajax,Lightbox ,asp.net,C#.net.
When opening a lightbox applied popup page(which contains update panel), the following exception is coming

"0x800a1391 - JavaScript runtime error: 'Sys' is undefined"
How to solve it?
Thanks in advance

George

Posted 15-Jan-16 0:40am

george@84

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F-ES Sitecore 15-Jan-16 6:50am

Do you have a ScriptManager on the page? Might need ToolkitScriptManager if you use anything from the ajax toolkit.

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deepankarbhatnagar · Answer 1 · 2016-01-15T01:08:00

Solution 1

For your help.

thanks,

asp.net - 'Sys' is undefined javascript error - Stack Overflow[^]

Microsoft JScript runtime error: 'Sys' is undefined[^]

Posted 15-Jan-16 1:08am

deepankarbhatnagar

0x800a1391 - JavaScript runtime error: &#39;Sys&#39; is undefined